Removed EncodedImageData, added three new encoded image formats, and changed the way screenshots work - saving screenshots will be broken until we have some way of flipping ImageData, though

--HG--
branch : minor

src/modules/image/wrap_Image.h

@@ -31,7 +31,6 @@ namespace image
 {
 	int w_getFormats(lua_State * L);
 	int w_newImageData(lua_State * L);
-	int w_newEncodedImageData(lua_State * L);
 	extern "C" LOVE_EXPORT int luaopen_love_image(lua_State * L);
 
 } // image