Support diff language view

[TGiles]

Currently if you view a .diff file with Laserwave, there's no highlighting on the added and removed parts of the diff. This makes it harder to tell which lines were added/removed compared to other color themes. Considering other themes have this feature I guess it's just some additional TextMate that needs to be defined.

@Jaredk3nt what colors out of the palette would you want for this? It looks like the + and - symbols can be customized to be different that the lines of text they're on as well as the "diff header" since I don't know what it's actually called...the part that says diff --git a/file b/file

I feel like I can take this on and get a PR up in a day or two

[Jaredk3nt]

I don't think I have used .diff files before so I'm not exactly sure what the UI looks like in VS Code. I would imagine it would look like the git diff view though which already has some defined colors

It basically just uses a transparent version of Maximum Blue and Hot Pink in place or red/green. So as long as it follows that pattern i'm up for it 👍 . Having the -/+ be the full version of the color would be pretty sweet looking as well.

If i'm missing anything post some examples here from other themes and I can weigh in

[TGiles]

Gotcha, sounds good. I'll post some examples so you're aware. I'll include the diff file I'm using as part of the examples for future reference.

2077 theme

Dark (visual studio)