Add ability to rename branches, remotes, and tags from within GitX

[darconeous]

Users should be able to rename the selected branch, remote, or tag by clicking on the already selected item in the outline view. This behavior is consistent with the UI behavior of Xcode, iTunes, Finder, iCal, and just about everything else that uses an outline view.

I tried to implement this myself a few weeks ago but ran into problems due to the fact that the NSOutlineView GitX uses is so heavily (and, IMHO, unnecessarily) customized.

[Uncommon]

Are you talking about in-place editing in the sidebar?

[darconeous]

Yes.

[Uncommon]

Yeah, I had made a note about this on my own fork - Uncommon#36