PLAY: move memory routines into memory.h.
Refactor file system routines to take a drawer.
CROP: switch to common file system routines.
CROP: SDL port.
CROP: show "/" for the root dir button in file menu on unix.
CROP: truncate dialog text when strings are too long.
CROP: retain case in file path prompts.
CROP: fix slider value type.
Move fccomp and lccomp into a common directory.
CROP: fix pointer arithmetic in FLI writer.
CROP: fix FLI writer saving garbage bytes due to even alignment.