Replaced love.graphics.isSupported and love.graphics.getSystemLimit with love.graphics.getSupported and love.graphics.getSystemLimits, which return tables with graphics feature / system limit enum names as keys, and support status / limit numbers as values.

Removed the 'hdrcanvas', 'dxt', and 'bc5' graphics feature enums now that they're deprecated in 0.9.x in favour of getCanvasFormats and getCompressedImageFormats.

--HG--
branch : minor

src/modules/graphics/Graphics.h

@@ -82,10 +82,7 @@ public:
 
 	enum Support
 	{
-		SUPPORT_HDR_CANVAS,
 		SUPPORT_MULTI_CANVAS,
-		SUPPORT_DXT,
-		SUPPORT_BC5,
 		SUPPORT_SRGB,
 		SUPPORT_MAX_ENUM
 	};