Create Code plugin for Vala-Lint

[pantor]

I think this would be really great to have. It will probably fix #136.

[4jNsY6fCVqZv]

@pantor Can you imagine to work on this issue?

[jeremypw]

It would be really nice to have the linting errors highlighted or underlined in the text

[pantor]

@4jNsY6fCVqZv I'm sorry, but unfortunately I don't have the time right now.

[4jNsY6fCVqZv]

@pantor Hi, thanks for your feedback!
I understand very well. What a pity, and if you look at it with a long-term perspective?
Otherwise: Do you know anyone who might be interested in working on this?
Hopefully there will be people who can realize this idea!

[jeremypw]

Added to new plugins project but maybe implement in main code. Probably should make vala-lint an optional dependency though.