squeeze simple north-american names into fewer bytes.

i made this with NES/SNES games in mind i.e. for player-given character names in JRPGs.
as of writing, v1 is the fastest, but v6 is the smallest.

you will need [m6502.h](https://github.com/floooh/chips/blob/c011ef1/chips/m6502.h)
to compile `decode-idk.c`. you will need [bass](https://github.com/ARM9/bass)
to assemble `decode.asm`.

someday, i want to extend this to use a non-constant LUT. (hidden markov models?)