Implement basic Parser about verona HOT 5 CLOSED

@plietar I think we should reuse, or at least heavily borrow from your prototype.

from verona.

The prototype uses Pegmatites, which is designed for teaching and for rapid prototyping. We should not aim to reuse any of the Pegmatite code for a production compiler.

from verona.

@sylvanc has a prototype parser in a private repo he was working on that might be a useful starting point.

The current parser has some quirks, that I don't think need replicating. It tries to accept a mix of ML like syntax, and only requires parenthesis where necessary

   if true {..} else {..}

versus

   if (true) {..} else {..}

I think we should just enforce parens as it makes the syntax more regular.

from verona.

I agree. Fuzzy syntax creates complications for the compiler for no additional benefits to the user. We may want to re-think this later, by adding syntactic sugar to the language (and its own parsing rules), but that has to be a conscious act for real benefit, not premature laziness.

from verona.

Superseeded by #111

from verona.