Added love.graphics.getSystemLimit (resolves issue #840). Deprecated love.graphics.getMaxPointSize.

love.graphics.getSystemLimit currently accepts these enum strings: “pointsize”, “texturesize”, “multicanvas”, and “canvasfsaa”.

src/modules/graphics/opengl/OpenGL.h

@@ -215,6 +215,11 @@ public:
 	 **/
 	int getMaxTextureSize() const;
 
+	/**
+	 * Returns the maximum supported number of simultaneous render targets.
+	 **/
+	int getMaxRenderTargets() const;
+
 	/**
 	 * Get the GPU vendor of this OpenGL context.
 	 **/
@@ -231,6 +236,7 @@ private:
 
 	float maxAnisotropy;
 	int maxTextureSize;
+	int maxRenderTargets;
 
 	Vendor vendor;