assmblr.go checkpoint commit: introduce initial lexer struct and methods
Begin implementing state-functions for assmblr lexer. Also stole more lexer methods from Rob Pike, as needed by my state functions.
Initial commit of the Haskell version of Hack assembler! Doesnt so IO yet, obv.
Add a buttload of parsing stuff. this is a checkpoint commit.
finish basic parsing infrastructure, add command for parsing A-commands