Fixed lexer: non-operator symbols shouldn't have values. Let them be #f.
I'm going back and forth on lexing stupid symbols and whether they
should have values. I'm adding the values back so that my transformers
make more sense to a casual reader... (eg "{" vs #f)
Refactored "void" | type to returnType to make translating easier.
WIP on ch 11. Not quite done, but I want to work on 12 for now.