Added feature to build collections of ROM's based on a filter (#76)

* fix: added visual feed back for mass rom matching

* chore(deps): EmulatorJS version bump

* chore(deps): nuget package version bump

* feat: added cover art to the emulator

* ci: updated .gitignore

* ci: remove .DS_Store files

* feat: updated the about box, and labeled the IGDB user score

* chore(deps): EmulatorJS version bump

* feat: start of collections build, and styling changes

* fix: updated PlatformMap.json file with more platforms and fixed SNES extensions

* feat: more progress on romsets

* doc: updated readme to include new screenshots and discord link

* fix: repairs an issue where the author column in signatures was too narrow

* chore(deps): EmulatorJS version bump

* feat: Collection build code mostly complete

* fix: renamed collection classes to avoid conflicts in Swagger

* Re-wrote collection builder to correct major bugs and performance

* Completed collection builder and zipper

* API changes completed

* Fixed some last minute Collections API bugs

* Collections mostly complete. Todo: delete button

* Completed collections build

gaseous-tools/Common.cs

@@ -13,7 +13,7 @@ namespace gaseous_tools
 		/// <returns></returns>
 		static public object ReturnValueIfNull(object? ObjectToCheck, object IfNullValue)
 		{
-			if (ObjectToCheck == null)
+			if (ObjectToCheck == null || ObjectToCheck == System.DBNull.Value)
 			{
 				return IfNullValue;
 			} else