CROP: fork from Pristine/CROP.

Delete MAKEFILE.TC, MAKEFILE.WC, TAGS.
Delete *.BAK, *.BAT, *.EXE, *.I, *.LNK, *.MAP, *.OBJ, *.OUT.
CROP: switch to tasm.
CROP: switch makefile default target to tcc.
CROP: decap source files.
CROP: add include guard for jimk.h.
CROP: remove getd.
CROP: remove xordot.
CROP: remove clipline.
CROP: remove oblit8.
CROP: remove xor_words.
CROP: remove xlat.
CROP: remove back_scan.
CROP: remove fcontrast.
Merge pull request #11 from wangds/crop_prune

Remove unused asm in CROP.