Add commit history tree color settings/options

[NordicAngel]

I have been checking out GitFiend and like it so far. Though I would suggest a way of customizing the look of the commit tree. As far as I can tell the current colors are per commit and based on the user who made the commit. I would like a way of seeing the tree color coordinated based on branch color and maybe a way of highlighting a specific branch. I wanna specific this as an option as I also like the current view.

[NordicAngel]

I am referring to the commit graph when i say 'commit tree'.

[GitFiend]

Yeah, I thought about doing this initially. I didn't think of a nice way to colour by branch as branches often share a lot of commits. I like the second idea of highlighting a branch/path through you can select.

[NordicAngel]

When branches share commits there could be two or more parallel lines touching for those commits, this would also work well with highlighting then only the one line would be highlighted. You could also take inspiration from how other client does it does it instead.