Add Vala language

[luaVolk]

No description provided.

[RunDevelopment]

Thank you for contributing!

There are however a few problems we have to fix before we can merge this.

1. Because Vala allows any number of spaces after a function name, you will have to change the function pattern to match things like void main () { ... }.
2. The number pattern does not include 0.75f.
3. -> is not matched by puncuation.

I also left you some comments.

[RunDevelopment]

Please re-run gulp and then I will gladly merge this.