Support for TikZ/PGF

[r-stein]

Since TikZ/PGF is very common and used by a lot of people way may add support for that. What would you expect to be added to support TikZ/PGF?

Required:

• [ ] syntax highlighting

Should be added:

• [ ] in editor hover-preview of the image
• [ ] cwl/other completions

Optional:

• [ ] Input files: fill-all helper and jump-to-anywhere support for
  • \addplot table {|};
  • \addplot file {|};
• [ ] Libraries: fill-all helper for \usetikzlibrary and \usepgfplotslibrary

I have started to write a TikZ/PGF syntax to enrich the default LaTeX syntax (and create a PR there), you can test it here.