Trebuchet Settings UI Refresh

- Overview Panel contains all Launcher Settings
  - Accessible through long press on Workspace or HW Menu button
  - Settings are held in a SlidingPanel in the Overview Panel
  - Replace the Settings shortcut in Overview Panel with Themes shortcut
  - Replace widgets icon with new widgets icon from Launcher3
- Trebuchet Settings changes no longer require restarting Process
- Transition Effects have PNG Sequence to show animation sequence
- Remove PageIndicator click event to open Overview Panel in AppTray

Contributors:
  Adrian Foulk - UX Lead
  Abishek Devkota - Project Manager
  Hayden Schoen - UX Designer

Change-Id: I2186213960cf12e840e814757894fe104551856b