R1:0ede616f314b

Update the "View Options" menu for recent filetree changes

Summary:
Ref T13516. Minor improvements here:

- Show key commands in the "View Options" dropdown.
- Organize it slightly better.
- Improve disabled item behaviors a little bit.
- Add a "Browse Directory" action.
- Rename "...in Diffusion" to "...in Repository".
- Make "d", "D", and "h" use the same targeting rules as "\".
- When you hide a file with the "h" menu item, select it.

Test Plan: Poked at the menu a lot, ran into less…