Syntax highlighting could use improvement

[minestarks]

The TextMate grammar used for Q# syntax highlighting in VS Code is missing some patterns that would help the syntax highlighting look nicer.

Compare:

The Q# looks pretty boring in comparison to other languages with good support.

I think we can start by defining patterns for function calls and numeric literals, which are seen in these screenshots. There may be others that are interesting as well.

[Morcifer]

Hi @minestarks, @sezna, can I pick this one up?

I have function definitions, function calls, numbers and variables all working.

However, function calls and variables also end up applied to attributes and to imports. Is it better that I make designated rules for them as part of this issue, or would it be better to make a followup?

(this comment was edited several times as I kept working on the issue, sorry about that).