- Use the new functions in Variant to determine the validity and resulting
type of operators.
- Split the operator function in codegen between binary and unary, since
the unary ones have now a special requirement of having the second
argument to be the NIL type when requesting info.
Sometimes to fix something you have to break it first.
This get GDScript mostly working with the new tokenizer and parser but
a lot of things isn't working yet. It compiles and it's usable, and that
should be enough for now.
Don't worry: other huge commits will come after this.
