Now using a Hammer implementation, the lzw-ab code has been removed

- Removed some obsolete comments

TODO: Parameterize constraints on ctx->next in validations to accomodate EarlyChange

- Add debug code to print potential codes at each bit length into a file

- act_LZW_literal wasn't firing, needed VDRULE -> AVDRULE
- set table entries to NULL when clearing
- add LZW_firstcode rule
- act_LZW_firstcode returns a HBytes instead of uint

separate n bit codewords from n bit literals/clear/EOD

Also, reorder validations to line up with H_RULE()s in init

TODO: use HCountedArray or HBytes instead of uint8_t*