add basic command-line interface (patch.lua)

add macros
implement push/pop/jpop as macros
be able to point to specific args of push/pop using variables
add file-reading directives (e.g. for automatic hook injection macros)
allow generation of shared object files (zelda overlays specifically)

don't require colons for +/- labels (this shouldn't break anything right?)

write tests for everything (try to focus on code paths and edge cases)
test unary tokens in particular

improve parser terminology

add a gameshark writer

improve writer performance (just copypaste what you did in patch.lua)

long term: add delay slot warnings

externally document more stuff like syntax