There is only one file in this folder that is in scope of
GSoD - image_decoder.h. It was in great shape docwise though,
so not much review required.
The rest of the headers have received a doxy group definition.
Add limited support for unpacked PICT bits which FPFP Mac requires.
SCI games use packed PICT bits unless an image is less than 8 bytes
per row in which case they can't be packed, like FPFP's shovel icon.
Fixes bug #7059 which prevents the game from being completed.
