Added WRL frontend for Win8 and WP8

Merged Qt, SDL and WRL frontend on the same corewrapper
Moved OpenGL code out of SDL and Qt frontends to OpenGl backend
(JGfx.cpp)
Updated file system and network code to be compatible with WRL

projects/mtg/include/PrecompiledHeader.h

@@ -15,16 +15,19 @@
 
 #include <assert.h>
 
+#ifdef WP8
+#include <wrl.h>
+#include <wrl/client.h>
+#else
+#include <boost/shared_ptr.hpp>
+#endif
+
 #include "JGE.h"
 #include "JFileSystem.h"
 #include "JLogger.h"
 
 #include "GameOptions.h"
 
-#ifndef WP8
-#include <boost/shared_ptr.hpp>
-#endif
-
 #if defined (WP8) || defined (IOS) || defined (ANDROID) || defined (QT_CONFIG) || defined (SDL_CONFIG)
 #define TOUCH_ENABLED
 #endif