Merge changes I2d517a2b,Ia59e2d97,Id98763d8,Ie3f57dd4,Ib5ddee5c, ...

* changes:
  Fixed a bug where messages could be invisible
  Implemented rounded clipping for groups
  Added padding between notifications and qs on lockscreen
  Insetting notifications on the lock screen
  Increased the notification paddings
  Implemented animations for rounding
  Refactored PropertyAnimator for easier usability
  Implemented rounded corners for notifications