+ add compatibility functions InitGem and ExitGem which call through to InitGraph/CloseGraph
* enable usages of InitGem and ExitGem
* enable graph driver parameters
Added Bitmap versions of the VGA images
* Use GraphResult in InitGem to detect whether graphic mode could be successfully initialized
+ add a 16 bpp FPC compatible version of the images for PTC Graph
Get basic graph based version working (keyboard gets stuck and there's much flickering; likely a timing problem)
* increase the size each image has in memory
* enable the detection of graph and fallback to the PTC images for now
* FPC stores Width and Height as LongWords and without the need to add 1