* Get rid of redundant arity field from op defs. Reorder and renumber ops. Fix bb_end for abort and exit.
* FATE does not accept arbitrary stack positions, only the accumulator aka stack 0.
STR_EQ is not needed, the regular EQ instruction can handle strings as well. Having
an instruction for list append is quite handy though (would need two passes to do it
tail recursive in FATE assembly)
* Add hash, signature and object types.
* Add serilaize/deserialize test for new types.
* Document new types.
* Use aeserialization for base58c encoding/decoding.
