Use ANTLR as a build step to generate Lexer/Parser

[therapon]

It will need java and the antlr tools installed. See https://medium.com/dailyjs/compiler-in-javascript-using-antlr-9ec53fd2780f

Lets move the files to a better folder for now and create an issue to see if we can have a better solution

Originally posted by @therapon in #54