Implement automatic batching for points, lines, shapes, and images/quads.

The above are batched together into a single draw call when called without other drawing calls in between, as long as the following criteria are met:

- The texture is the same.
- The primitive type is the same (points cannot be batched with non-points).
- The love.graphics state is the same (aside from the current color - i.e. setColor - and the transform state).
- The active shader’s uniform values are the same.

You can examine the ‘drawcalls’ field of love.graphics.getStats() to help determine if your code is allowing for optimum batching.

--HG--
branch : minor

src/modules/graphics/opengl/Image.h

@@ -90,17 +90,7 @@ public:
 	bool loadVolatile() override;
 	void unloadVolatile() override;
 
-	/**
-	 * @copydoc Drawable::draw()
-	 **/
-	void draw(const Matrix4 &m) override;
-
-	/**
-	 * @copydoc Texture::drawq()
-	 **/
-	void drawq(Quad *quad, const Matrix4 &m) override;
-
-	const void *getHandle() const override;
+	ptrdiff_t getHandle() const override;
 
 	const std::vector<StrongRef<love::image::ImageData>> &getImageData() const;
 	const std::vector<StrongRef<love::image::CompressedImageData>> &getCompressedData() const;
@@ -139,8 +129,6 @@ public:
 
 private:
 
-	void drawv(const Matrix4 &t, const Vertex *v);
-
 	void preload();
 
 	void generateMipmaps();