Rewrite lexer

[Vild]

The lexer is currently really really slow because of all the compile time code generation, This must be fixed!
Why is is so slow currently is because it overuses ctRegex to match for tokens, this should be change to something else that isn't regex, but still is as fast as the ctRegex result (hopefully).

[shaybix]

https://www.youtube.com/watch?v=HxaD_trXwRE

the concept employed in Go templating could very much be used here. I tremendously benefited from this talk on Lexical Analysis.