Apply StyleCop.Analyzers to all projects and fix more things

Author: jnm2

.editorconfig

@@ -1,5 +1,7 @@
 [*.cs]
 
+dotnet_sort_system_directives_first = true
+
 # CS8509: The switch expression does not handle all possible values of its input type (it is not exhaustive).
 dotnet_diagnostic.CS8509.severity = none
 

TfvcMigrator.sln

@@ -8,6 +8,7 @@ EndProject
 Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "Solution Items", "Solution Items", "{DC7A78BA-6257-45FF-9A9B-4FB61DF2BD91}"
 	ProjectSection(SolutionItems) = preProject
 		.editorconfig = .editorconfig
+		src\Directory.Build.props = src\Directory.Build.props
 	EndProjectSection
 EndProject
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "TfvcMigrator.Tests", "src\TfvcMigrator.Tests\TfvcMigrator.Tests.csproj", "{2EA6C987-0EFC-4C95-8593-663730B40F18}"

src/Directory.Build.props

@@ -0,0 +1,7 @@
+<Project>
+
+  <ItemGroup>
+    <PackageReference Include="StyleCop.Analyzers" Version="1.2.0-beta.406" PrivateAssets="all" />
+  </ItemGroup>
+
+</Project>

src/TfvcMigrator.Tests/EnumerableExtensionsTests/WithLookaheadTests.cs

@@ -1,9 +1,9 @@
 using System;
+using System.Collections.Generic;
+using System.Threading.Tasks;
 using NSubstitute;
 using NUnit.Framework;
 using Shouldly;
-using System.Collections.Generic;
-using System.Threading.Tasks;
 
 namespace TfvcMigrator.Tests.EnumerableExtensionsTests
 {

src/TfvcMigrator.Tests/UtilsTests/ContainsCrlfTests.cs

@@ -1,6 +1,6 @@
-using NUnit.Framework;
+using System.IO;
+using NUnit.Framework;
 using Shouldly;
-using System.IO;
 
 namespace TfvcMigrator.Tests.UtilsTests
 {

src/TfvcMigrator/TfvcMigrator.csproj

@@ -23,10 +23,6 @@
   <ItemGroup>
     <PackageReference Include="LibGit2Sharp" Version="0.27.0-preview-0175" />
     <PackageReference Include="Microsoft.TeamFoundationServer.Client" Version="16.170.0" />
-    <PackageReference Include="StyleCop.Analyzers" Version="1.2.0-beta.406">
-      <PrivateAssets>all</PrivateAssets>
-      <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
-    </PackageReference>
     <PackageReference Include="System.CommandLine" Version="2.0.0-beta2.21617.1" />
     <PackageReference Include="TaskTupleAwaiter" Version="2.0.0" />
   </ItemGroup>