bitbox.mk : re added missing dependency on data files
blitter.c/h :
	corrected bug when y was <0
	improved p16 sprites blitting (not finished)
	added tileset blitting (not finished ! many modes missing !)
fuzzy tile : changed exec mode/line ending.
scripts/* : added a simple tmx file 2 binary conversion + sprite generator
test_engine/* : added a simple engine demo