Started drawImage, implemented drawRawColorImage

General:
[x] Implement `drawImage`
[ ] Decompress images in `drawImage`

Color images:
[x] Implement `drawRawColorImage`
[ ] Implement `drawPalettedImage`
[x] Link `drawRawColorImage` to `drawImage`
[ ] Link `drawPalettedImage` to `drawImage`

Monochrome images:
[ ] Implement `drawRawMonoImage` (should work with arbitrary-sized sprites, Axe's Bitmap command ?)
[ ] Link `drawRawMonoImage` to `drawImage`