UDP Fixes

-=-=-=-=-

Curse the day I decided to port UDP code, as it ended up
being two nights of work.  At least It's done now (I hope).

-Fixed UDP Support, API seems stable
-Added UDP Chat demo (chat that can lose your packets, heh)
-Added helpers to areas and bodies to get list of collided bodies and contained bodies.
-Sped up screen/viewport capture code.
-Added code to save an image as PNG
-Small fix so scripts register their singletons after modules did.

core/script_language.h

@@ -54,6 +54,8 @@ public:
 	static int get_language_count();
 	static ScriptLanguage *get_language(int p_idx);
 	static void register_language(ScriptLanguage *p_language);
+
+	static void init_languages();
 };