Not able to load image.bin directly from REZ file

[JayFoxRox]

If we could load the image.bin we could enhance the usability a lot at the cost of having to keep a couple more MB of memory around.

This can be implemented by checksumming the REZ and then hardcoding the pointers for the image.bin.
Optionally the file-table or resource index could be parsed, however that would add a lot of complexity to the design.