Update mobile version to mobile v2.2.1

The android version just got a much needed update to fix some resolution issues on devices with cutouts.

It turns out the mobile source was actually pretty out of date, like 3 versions out of date! This commit brings it up to date.

All the changes have just been about keeping the game running on modern devices, though. The biggest change was adding the Starling library to the project, which made the game GPU powered and sped the whole thing up.

mobile_version/src/starling/errors/AbstractMethodError.as

@@ -0,0 +1,22 @@
+// =================================================================================================
+//
+//	Starling Framework
+//	Copyright Gamua GmbH. All Rights Reserved.
+//
+//	This program is free software. You can redistribute and/or modify it
+//	in accordance with the terms of the accompanying license agreement.
+//
+// =================================================================================================
+
+package starling.errors
+{
+    /** An AbstractMethodError is thrown when you attempt to call an abstract method. */
+    public class AbstractMethodError extends Error
+    {
+        /** Creates a new AbstractMethodError object. */
+        public function AbstractMethodError(message:*="Method needs to be implemented in subclass", id:*=0)
+        {
+            super(message, id);
+        }
+    }
+}