Remove Exts.Enum<T>

This functionality is now built in. We can rely on the built in functions rather than a custom class.

OpenRA.Game/Exts.cs

@@ -676,27 +676,4 @@ namespace OpenRA
 
 		public ReadOnlySpan<char> Current { get; private set; }
 	}
-
-	public static class Enum<T>
-	{
-		public static T Parse(string s) { return (T)Enum.Parse(typeof(T), s); }
-		public static T[] GetValues() { return (T[])Enum.GetValues(typeof(T)); }
-
-		public static bool TryParse(string s, bool ignoreCase, out T value)
-		{
-			// The string may be a comma delimited list of values
-			var names = ignoreCase ? Enum.GetNames(typeof(T)).Select(x => x.ToLowerInvariant()) : Enum.GetNames(typeof(T));
-			var values = ignoreCase ? s.Split(',').Select(x => x.Trim().ToLowerInvariant()) : s.Split(',').Select(x => x.Trim());
-
-			if (values.Any(x => !names.Contains(x)))
-			{
-				value = default;
-				return false;
-			}
-
-			value = (T)Enum.Parse(typeof(T), s, ignoreCase);
-
-			return true;
-		}
-	}
 }