Added OpenGL debug groups for most graphics operations when love is built in debug mode for iOS. The Xcode frame capture tool uses them to create nice visual groups for OpenGL function calls.

src/modules/graphics/opengl/SpriteBatch.cpp

@@ -233,6 +233,8 @@ void SpriteBatch::draw(float x, float y, float angle, float sx, float sy, float
 	if (next == 0)
 		return;
 
+	OpenGL::TempDebugGroup debuggroup("SpriteBatch draw");
+
 	Matrix t(x, y, angle, sx, sy, ox, oy, kx, ky);
 
 	OpenGL::TempTransform transform(gl);