Added a variant of love.graphics.clear which accepts a color table argument for each active canvas, allowing it to clear active canvases to different colors without having to call love.graphics.setCanvas.

src/modules/graphics/opengl/Graphics.h

@@ -86,6 +86,11 @@ public:
 	 **/
 	void clear(Color c);
 
+	/**
+	 * Clears each active canvas to a different color.
+	 **/
+	void clear(const std::vector<Color> &colors);
+
 	/**
 	 * Discards the contents of the screen.
 	 **/