Implement ZScript Parser

[KaptainMicila]

Some time ago, I wanted to make this extension something more than a syntax highlighter.

This kind of "upgrade" requires a parser. This is because all features that I want to implement need to know the code context and structure to work.

Sadly, I don't have neither the ability and the time to learn how to such thing: this extension won't become abandoned, as I will be here for all kinds of assistance and quality control for all sorts of modifications done on this repo.

Whoever wants to help me is free to do so: the code quality isn't the best, as I was learning typescript while I was working on this, but this means that even newbies might understand what I did.

[KaptainMicila]

By the way, the features I want to add are:

1. Code autocomplete
2. Error checking

[KaptainMicila]

I decided that, because:

• My lazyness
• VSCode web edition compatibility
• Lack of skill

This extension WILL NOT support nodejs features. Those should be added to a different extension.