Improve TV PiP menu buttons

- Save focused button when moving and changing orientation (e.g. during
  expanded mode being toggled)
- Focus the first button when the menu is opened
- Makes sure all buttons are visibly reachable by setting the right
  gravity based on orientation and whether all the buttons fit
- Scrolls to the focused button if it happens to go out of bounds during
  any change
- Fade buttons out and in during orientation change
- Scale buttons to 1.1x when selected
- Fix move button description (typo in resource reference)

Bug: 220109276
Bug: 219887361
Test: manual

Change-Id: Ibe1b2ee3e505bd218c49f6cd0cbcbf7956452b26