PHP 8.1 support (#152)

* Set up PHP version compatibility checks

* Update zf1-future

* Ignore phpcs packages

* Update depenencies. Specifically, gump required updates for PHP compatibility.

* Fix PHP 8.x compatibility issues in our code and rebuild.

* Update mkdocs config

Author: cazzerson

.gitignore

@@ -15,6 +15,7 @@ node_modules
 analysis/test/js/coverage
 analysis/test/php/coverage
 docs/site
+/vendor
 
 # Configuration Files
 service/config/config.ini

analysis/Gemfile.lock

@@ -1,7 +1,7 @@
 GEM
   remote: https://rubygems.org/
   specs:
-    chunky_png (1.3.4)
+    chunky_png (1.4.0)
     compass (1.0.3)
       chunky_png (~> 1.2)
       compass-core (~> 1.0.2)
@@ -14,18 +14,18 @@ GEM
       sass (>= 3.3.0, < 3.5)
     compass-import-once (1.0.5)
       sass (>= 3.2, < 3.5)
-    ffi (1.9.10)
-    multi_json (1.11.2)
-    rb-fsevent (0.9.5)
-    rb-inotify (0.9.5)
-      ffi (>= 0.5.0)
-    sass (3.4.16)
+    ffi (1.15.5)
+    multi_json (1.15.0)
+    rb-fsevent (0.11.1)
+    rb-inotify (0.10.1)
+      ffi (~> 1.0)
+    sass (3.4.25)
 
 PLATFORMS
-  ruby
+  arm64-darwin-21
 
 DEPENDENCIES
   compass (~> 1.0.1)
 
 BUNDLED WITH
-   1.10.5
+   2.2.24