RC: Custom System Animations

Allows setting of some system animations.

Current List:
Activity Open
Activity Close
Task Open
Task Close
Task Move to front
Task Move to back
Window Open
Window Close
Window Intra Open
Window Intra Close

Duration Control

Prevent overridePendingTransition option

PS7: use icon provided by Kamil Nowakowski
     fix whitespaces
     rename preference to Animations

PS10: resize icons

Change-Id: I9ca278d9c40dcda0d0dbd85cce966a8e06b028af