- Add support for push, pop, msave, and mrest instructions
- Fix up send argument formatting for some send instructions
- Add send arguments for more send instructions
- Fix up the sets of registers allowed for send arguments
- manpage
- binary output?
- check for more error cases.
- boolean types in parser internal structs where appropriate
- replace GL* with non-GL?
- support labels for branch/jump instruction destinations
- support math on immediate operand values
- break/cont syntax should be better
- valgrind it
- do something to allow use as a library?
