Fixed over 500 compile warnings. Mostly:

* Unused variables.
* Missing newlines at ends of #included files.
* signed int loop variables where the termination condition is an unsigned 'get number of' function.
* 'NULL' used inappropriately for an integer or character constant (NULL is a pointer)
* abstract base classes with no virtual destructor.
* Floating point constants used to initialise integer variables.

Demos/OpenGL/RenderTexture.cpp

@@ -42,7 +42,7 @@ void RenderTexture::Printf(char* str,	BMF_FontData* fontData, int startx,int sta
 	unsigned char c;
 	int rasterposx = startx;
 	int rasterposy = starty;
-	while (c = (unsigned char) *str++) {
+	while ((c = (unsigned char) *str++)) {
 		BMF_CharData & cd = fontData->chars[c];
 		
 		if (cd.data_offset!=-1) {