TODO


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for now:

listbas - Turbo BASIC tokens for variables 128-255 not recognized.

These may need library (xex.c) changes:
xexcat: handle run/init addresses embedded in a segment longer than
  2 bytes. Implemented in library, but not used by xexcat yet.
xexcat: warn if an an init address occurs before the code it
  references. or at least if it occurs before *any* code! (partially
  implemented; warn if segment 1 has init address).


later:
- add cassio?
- file magic? (finish it, see if file upstream wants it)
- new tool: a8grep. knows about xex files (but works on others), can
  search for screen codes or inverse video, etc. also a8strings.