Add three theme options

[oliviaBahr]

• PR Description

  • Make title color options separate from border color options
  • Add option to change title color of selected tabs in inactive views

It's not a super important change I've just always personally thought keeping selected tabs in inactive views highlighted the same color (and just -= AttrBold) looks wrong. Normal My preference is just bold

When I added the change I noticed that changing the border color option also changed the title color and I thought that was unexpected behavior so I added the two other options. https://github.com/jesseduffield/lazygit/blob/6390b056785f6ea3e64acbe58eac163c18af1cbe/docs/Config.md?plain=1#L56-L62

• Please check if the PR fulfills these requirements

• [ ] Cheatsheets are up-to-date (run go generate ./...)
• [ ] Code has been formatted (see here)
• [ ] Tests have been added/updated (see here for the integration test guide)
• [ ] Text is internationalised (see here)
• [ ] Docs (specifically docs/Config.md) have been updated if necessary
• [ ] You've read through your own file changes for silly mistakes etc

[stefanhaller]

I'll let @jesseduffield have a look at this, as I'm not personally interested in this change. Hope this doesn't sound offensive, I just need to cut down a bit on the number of things that I get involved in.

(Happy to help with getting the change into gocui though, if Jesse decides we want this.)

[jesseduffield]

I will get to this very soon!