[Enhancement] Make "Highlight only current branch" feature available for any branch

[goran-w]

The "Highlight only current branch" is an excellent feature, but unfortunately it's a bit too "blunt" of a tool since we have to switch to a specific branch in order to use it.

It would have been MUCH more useful if it could quickly be enabled for ANY branch (even remote ones), without requiring it to be a) a local branch and b) the current one...

This should also be a trivial fix to implement, the most difficult part would probably be to decide upon the UI for activating it. (Initially it could be just for a single branch at a time, like the original feature, but ideally it could work more similar to the visibility filter so that multiple branches could be "highlighted" - i.e colored, while the rest are gray...)