Added love.graphics.getCanvasFormats and love.graphics.getCompressedImageFormats, and removed love.graphics.hasCanvasFormat.

The two new functions return tables containing the names of all relevant formats as keys, and boolean values indicating whether the formats are supported.

src/modules/graphics/opengl/Graphics.h

@@ -455,6 +455,11 @@ public:
 	 **/
 	double getSystemLimit(SystemLimit limittype) const;
 
+	/**
+	 * Gets whether a graphics feature is supported on this system.
+	 **/
+	bool isSupported(Support feature) const;
+
 	void push();
 	void pop();
 	void rotate(float r);