Add Global Ignore

[404Wolf]

Add support for a global .vtignores.

• vt config set globalIgnoreFiles=/foo/bar/buzz.txt to add a "global" ignore file.
• vt config ignore to edit the global ignore file in your default editor.
• vt config where to get path to config files.

Default will look for global ignore at ~/.config/vt/.vtignore

[maxmcd]

What is the hope here? What kind of things would we expect in the global ignore?

[404Wolf]

What is the hope here? What kind of things would we expect in the global ignore?

Mostly the same that you get of global .gitignores--

It lets you ignore things without pushing the thing that you ignored in the vtignore. Like, I have .direnv in all my .vtignores, but I don't think most val town users use direnv, and if I were working on a PR to someone's val, I wouldn't want to modify their .vtignore. I added .direnv to my global ignore, which isn't pushed anywhere, and it solves the problem. This applies also to all classes of files that live in project folders that you wouldn't want to push your .vtignore for the project with.