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

JGE/JGE.vcxproj

@@ -156,6 +156,7 @@
   </ItemDefinitionGroup>
   <ItemGroup>
     <ClCompile Include="Dependencies\SDL\src\main\windows\SDL_windows_main.c" />
+    <ClCompile Include="src\corewrapper.cpp" />
     <ClCompile Include="src\Encoding.cpp" />
     <ClCompile Include="src\JAnimator.cpp" />
     <ClCompile Include="src\JApp.cpp">
@@ -298,6 +299,7 @@
     <ClCompile Include="src\zipFS\zstream.cpp" />
   </ItemGroup>
   <ItemGroup>
+    <ClInclude Include="include\corewrapper.h" />
     <ClInclude Include="include\DebugRoutines.h" />
     <ClInclude Include="include\decoder_prx.h" />
     <ClInclude Include="include\Encoding.h" />