Merge remote-tracking branch 'origin/master' into Replace_Proxy_With_Int

# Conflicts:
#	src/box2dx/Box2D.NetStandard/Collision/BroadPhase.cs
#	src/box2dx/Box2D.NetStandard/Dynamics/Contacts/ContactSolver.cs

Author: HughPH

.github/ISSUE_TEMPLATE/bug_report.yml

@@ -0,0 +1,23 @@
+name: 'Bug Report'
+description: Report a bug in Box2D .NET Standard
+labels: ["bug"]
+
+body:
+  - type: textarea
+    id: description
+    attributes:
+      label: Description
+    validations:
+      required: true
+  - type: textarea
+    id: reproduce
+    attributes:
+      label: How To Reproduce
+    validations:
+      required: true
+  - type: textarea
+    id: expected
+    attributes:
+      label: Expected Behavior
+    validations:
+      required: true

.github/ISSUE_TEMPLATE/docs_report.yml

@@ -0,0 +1,11 @@
+name: 'Docs Report'
+description: Report an issue in Box2D .NET Standard's documentation
+labels: ["documentation"]
+
+body:
+  - type: textarea
+    id: description
+    attributes:
+      label: Description
+    validations:
+      required: true

.github/PULL_REQUEST_TEMPLATE.md

@@ -0,0 +1,5 @@
+<!-- Thank you!
+Please read the contributing guidelines: https://github.com/benukhanov/box2d-netstandard/blob/v2.4/CONTRIBUTING.md
+-->
+
+Fixes # (issue)

.github/workflows/unit-tests.yml renamed to .github/workflows/box2d-build.yml

@@ -1,4 +1,4 @@
-name: Unit Tests
+name: Box2D Build & Unit Tests
 
 on:
   push:
@@ -19,6 +19,8 @@ jobs:
       - name: Setup .NET Core
         uses: actions/setup-dotnet@v1
         with:
-          dotnet-version: "3.1.x"
-      - name: Execute Tests
+          dotnet-version: "5.0.x"
+      - name: Build
+        run: dotnet build src/ -c Release
+      - name: Unit Tests
         run: dotnet test src/ -c Release

.github/workflows/build.yml renamed to .github/workflows/box2d-examples-build.yml

@@ -1,10 +1,14 @@
-name: Build
+name: Box2D Examples Build
 
 on:
   push:
     branches: [v2.4]
     paths:
-      - src/box2dx/Box2D.NetStandard/**
+      - examples/**
+  pull_request:
+    branches: [v2.4]
+    paths:
+      - examples/**
 
 jobs:
   build:
@@ -16,5 +20,5 @@ jobs:
         uses: actions/setup-dotnet@v1
         with:
           dotnet-version: "5.0.x"
-      - name: Box2D Build
-        run: dotnet build src/box2dx/Box2D.NetStandard -c Release
+      - name: Build
+        run: dotnet build examples/ -c Release

CODE_OF_CONDUCT.md

@@ -0,0 +1,128 @@
+# Contributor Covenant Code of Conduct
+
+## Our Pledge
+
+We as members, contributors, and leaders pledge to make participation in our
+community a harassment-free experience for everyone, regardless of age, body
+size, visible or invisible disability, ethnicity, sex characteristics, gender
+identity and expression, level of experience, education, socio-economic status,
+nationality, personal appearance, race, religion, or sexual identity
+and orientation.
+
+We pledge to act and interact in ways that contribute to an open, welcoming,
+diverse, inclusive, and healthy community.
+
+## Our Standards
+
+Examples of behavior that contributes to a positive environment for our
+community include:
+
+* Demonstrating empathy and kindness toward other people
+* Being respectful of differing opinions, viewpoints, and experiences
+* Giving and gracefully accepting constructive feedback
+* Accepting responsibility and apologizing to those affected by our mistakes,
+  and learning from the experience
+* Focusing on what is best not just for us as individuals, but for the
+  overall community
+
+Examples of unacceptable behavior include:
+
+* The use of sexualized language or imagery, and sexual attention or
+  advances of any kind
+* Trolling, insulting or derogatory comments, and personal or political attacks
+* Public or private harassment
+* Publishing others' private information, such as a physical or email
+  address, without their explicit permission
+* Other conduct which could reasonably be considered inappropriate in a
+  professional setting
+
+## Enforcement Responsibilities
+
+Community leaders are responsible for clarifying and enforcing our standards of
+acceptable behavior and will take appropriate and fair corrective action in
+response to any behavior that they deem inappropriate, threatening, offensive,
+or harmful.
+
+Community leaders have the right and responsibility to remove, edit, or reject
+comments, commits, code, wiki edits, issues, and other contributions that are
+not aligned to this Code of Conduct, and will communicate reasons for moderation
+decisions when appropriate.
+
+## Scope
+
+This Code of Conduct applies within all community spaces, and also applies when
+an individual is officially representing the community in public spaces.
+Examples of representing our community include using an official e-mail address,
+posting via an official social media account, or acting as an appointed
+representative at an online or offline event.
+
+## Enforcement
+
+Instances of abusive, harassing, or otherwise unacceptable behavior may be
+reported to the community leaders responsible for enforcement at
+GitHub.
+All complaints will be reviewed and investigated promptly and fairly.
+
+All community leaders are obligated to respect the privacy and security of the
+reporter of any incident.
+
+## Enforcement Guidelines
+
+Community leaders will follow these Community Impact Guidelines in determining
+the consequences for any action they deem in violation of this Code of Conduct:
+
+### 1. Correction
+
+**Community Impact**: Use of inappropriate language or other behavior deemed
+unprofessional or unwelcome in the community.
+
+**Consequence**: A private, written warning from community leaders, providing
+clarity around the nature of the violation and an explanation of why the
+behavior was inappropriate. A public apology may be requested.
+
+### 2. Warning
+
+**Community Impact**: A violation through a single incident or series
+of actions.
+
+**Consequence**: A warning with consequences for continued behavior. No
+interaction with the people involved, including unsolicited interaction with
+those enforcing the Code of Conduct, for a specified period of time. This
+includes avoiding interactions in community spaces as well as external channels
+like social media. Violating these terms may lead to a temporary or
+permanent ban.
+
+### 3. Temporary Ban
+
+**Community Impact**: A serious violation of community standards, including
+sustained inappropriate behavior.
+
+**Consequence**: A temporary ban from any sort of interaction or public
+communication with the community for a specified period of time. No public or
+private interaction with the people involved, including unsolicited interaction
+with those enforcing the Code of Conduct, is allowed during this period.
+Violating these terms may lead to a permanent ban.
+
+### 4. Permanent Ban
+
+**Community Impact**: Demonstrating a pattern of violation of community
+standards, including sustained inappropriate behavior,  harassment of an
+individual, or aggression toward or disparagement of classes of individuals.
+
+**Consequence**: A permanent ban from any sort of public interaction within
+the community.
+
+## Attribution
+
+This Code of Conduct is adapted from the [Contributor Covenant][homepage],
+version 2.0, available
+[here](https://www.contributor-covenant.org/version/2/0/code_of_conduct.html).
+
+Community Impact Guidelines were inspired by [Mozilla's code of conduct
+enforcement ladder](https://github.com/mozilla/diversity).
+
+[homepage]: https://www.contributor-covenant.org
+
+For answers to common questions about this code of conduct, see the FAQ
+[here](https://www.contributor-covenant.org/faq). Translations are available
+[here](https://www.contributor-covenant.org/translations).

CONTRIBUTING.md

@@ -0,0 +1,25 @@
+# Contributing to Box2D .NET Standard
+
+No new features will be developed. Bug reports and any other improvements are welcome.
+
+## Table of Contents
+
+ - [Code of Conduct](#coc)
+ - [Bug Report](#bug)
+ - [Submission Guidelines](#submit-pr)
+
+## <a name="coc"></a> Code of Conduct
+
+Please read the [Code of Conduct](https://github.com/benukhanov/box2d-netstandard/blob/v2.4/CODE_OF_CONDUCT.md).
+
+## <a name="bug"></a> Bug Report
+
+Please open an [issue](https://github.com/benukhanov/box2d-netstandard/issues/new/choose) with details.
+
+## <a name="submit-pr"></a> Submission Guidelines
+
+1. [Fork](https://github.com/benukhanov/box2d-netstandard/fork) the repository.
+2. Clone the forked repository and then create a new branch.
+3. Commit your changes.
+4. Push your new branch.
+5. Send a pull request to `v2.4` or `v1.0` branch.

README.md

@@ -1,8 +1,8 @@
 ![Box2D Logo](https://box2d.org/images/logo.svg)
 
 # Box2D .NET Standard 
-[![Build](https://github.com/benukhanov/box2d-netstandard/actions/workflows/build.yml/badge.svg)](https://github.com/benukhanov/box2d-netstandard/actions/workflows/build.yml)
-[![Unit Tests](https://github.com/benukhanov/box2d-netstandard/actions/workflows/unit-tests.yml/badge.svg)](https://github.com/benukhanov/box2d-netstandard/actions/workflows/unit-tests.yml)
+[![Build](https://github.com/benukhanov/box2d-netstandard/actions/workflows/box2d-build.yml/badge.svg)](https://github.com/benukhanov/box2d-netstandard/actions/workflows/box2d-build.yml)
+[![Box2D Examples Build](https://github.com/benukhanov/box2d-netstandard/actions/workflows/box2d-examples-build.yml/badge.svg)](https://github.com/benukhanov/box2d-netstandard/actions/workflows/box2d-examples-build.yml)
 
 Box2D .NET Standard is the port of Box2D from C++ to C# by Ben Ukhanov & Hugh Phoenix-Hulme 2020.
 
@@ -25,6 +25,7 @@ In v1.0.x:
 
 In v2.4.x:
 - Code Optimisation must be enabled for things to work properly, and you **must not** have a debugger attached.
+- If you create two Bodies at the same Position, *Bad Things* will happen. It might crash, or it might just poison the DynamicTree. This could be fixed by checking *every* contact to make sure the objects are never in the exact same position, but this should never happen once the simulation is running, so the number of times the check would be useful is statistically insignificant. Just don't put things at the same place as other things. They only need to be different by float.Epsilon in either dimension.
 
 ## Source
 
@@ -56,10 +57,7 @@ In v2.4.x:
 
 ## Contributing
 
-Anyone who wants to contribute to this repository:
-- The changes will be in the new branch (feature/new or feature/bug-fix).
-- The new pull request will be started.
-- The new version will be published.
+Please read and follow the [contributing guidelines](CONTRIBUTING.md).
 
 ## Features
 
@@ -90,7 +88,7 @@ Anyone who wants to contribute to this repository:
 ### System
 
 - Centralized tuning parameters.
-- Pure .NET Standard 2.0+ library.
+- Pure .NET Standard 2.1+ library.[^1]
 - Please [See .NET Implementation Support](https://docs.microsoft.com/en-us/dotnet/standard/net-standard).
 
 ## Documentation
@@ -102,3 +100,5 @@ Anyone who wants to contribute to this repository:
 ## License
 
 Original C++ Box2D is developed by Erin Catto, under the [MIT license](https://en.wikipedia.org/wiki/MIT_License).
+
+[^1] .net standard 2.0 lacks System.MathF which is a dependency. System.Numerics.Vectors is not part of .net standard 2.0, but it is available as a Nuget package. There is a discussion [here](https://github.com/dotnet/runtime/issues/20113) about including System.MathF in System.Runtime.Extensions but it was decided not to do so. We also use stackalloc, Span<T>, System.HashCode, Math.Clamp and range expressions, which are not supported in .net standard 2.0.

examples/README.md

@@ -0,0 +1,8 @@
+# Box2D Examples
+
+Box2D Examples in a simulation window. Use different worlds [here](https://github.com/benukhanov/box2d-netstandard/blob/v2.4/examples/Box2D.WindowTests/Program.cs#L29).
+
+## Dependencies
+
+- [OpenTK.NetStandard](https://www.nuget.org/packages/OpenTK.NetStandard/)
+- [Box2D.NetStandard](https://www.nuget.org/packages/Box2D.NetStandard)

src/box2dx/Box2D.NetStandard.UnitTests/AddPairTest.cs

@@ -8,7 +8,7 @@ namespace Box2D.NetStandard.UnitTests
     public class AddPairTest
     {
         [Fact]
-        public void AddPairs()
+        public void Test()
         {
             for (int j = 0; j < 1; j++)
             {