Keyboard shortcut for editing the current path

[garrett]

We probably want a few different keyboard shortcuts (aligning to what file managers do, like Nautilus and Dolphin), but having a specific one for editing the path would be useful.

I'd suggest control-shift-L, which is similar to file managers and browsers (which use control-L). As we're in a browser, we cannot override the control-L, so having shift in the mix makes some sense.

This would be useful for not just quickly editing the path, but also for copying and pasting the path too. (That is, the shortcut, followed by control-c or control-v).

[garrett]

I've opened an issue for general keyboard shortcuts to discuss what other ones we might want, as well as a modal to show them. #451

But this one is obvious, and while we just have this one, the modal can be implemented separately, hence this being a separate issue for now.