Merge separate RGSS version build configs into one

Setup active RGSS version at runtime. Desired version can be
specified via config, or as default, auto detected from the game
files. This removes the need to build specifically for each
version, which should help packaging a lot.

This also greatly reduces the danger of introducing code that
wouldn't compile on all RGSS version paths (as certain code paths
were completely ifdef'd out).

This can be optimized more, eg. not compiling shaders that aren't
needed in the active version.

src/bitmap.h

@@ -73,10 +73,8 @@ public:
 	               int width, int height);
 	void clearRect(const IntRect &rect);
 
-#ifdef RGSS2
 	void blur();
 	void radialBlur(int angle, int divisions);
-#endif
 
 	void clear();