Added EFB Scale option to the OpenGL plug-in.

Renamed EFB Scale to Internal Resolution.
Removed Auto Scale option (it is now always on).
Added on-the-fly changing of the Internal Resolution in the OpenGL and Direct3D9 plug-ins.
Further consolidated the code in the video plug-ins.

git-svn-id: https://dolphin-emu.googlecode.com/svn/trunk@6240 8ced0084-cf51-0410-be5f-012b33b47a6e

Source/Core/VideoCommon/Src/Render.h

@@ -59,9 +59,6 @@ public:
 	static void SetLineWidth();
 	static void SetSamplerState(int stage,int texindex);
 	static void SetInterlacingMode();
-	// Live resolution change
-	static bool Allow2x();
-	static bool AllowCustom();
 
 	// Render target management
 	static int GetFrameBufferWidth();