some ideas:
- rgbasm: warn when jp could be replaced by jr
- rgbasm: find some smart way to include gbs files (music) and gbt/gbm files (gfx)
- rgbasm,xlink: add nocash symbols for _all_ labels
- xlink: when reading linkfile, trim line so that a spaces at the end of an [object] line don't break things
- xlink: -i option to identify banks at 0x7FFF
- xlink: look over how effectively sections are assigned
- rgbfix: add command line options to add GameGenie etc codes into ROM.

