Add GlowPadView extensions needed for lockscreeb/quicklaunch shortcuts
Fix layout of MultiWaveView and GlowPadView.

If the calculated size of the rings is much smaller than the measured
size (which is happening e.g. on mdpi 600x1024 tablets), the glow pad
appeared shifted to the right.
This happened due to the insets being calculated as difference of
available and needed size, and later on being added to the available
size. Example numbers (Nexus 4 with density forced to 160):
- computed size in onMeasure: 768x505
- scaled size in onMeasure: 505x505
- thus, insets are calculated as 131/0
- in onLayout, placementWidth (364) and max target width (108) are much
  smaller than width (768)
- thus, center is calculated as 131 + (768 / 2) = 515, thus shifted to
  the right

Fix that by not using width in the calculation, as the inset size
already takes it into consideration.
Quick launch shortcuts
Quick launch shortcuts screenOff action new icons
Quick launch powerMenu action
Navigation Bar: Rotate the search light in landscape

The current search light icon is an arrow pointing upwards, so while in portrait it points to the direction to be swiped to access Google Now (and the customizable shortcuts), in landscape it points upward as well which looks out of place, and swiping upwards reveals that you have to swipe towards the left to access those targets. Rotate it by 270 degrees to make it point towards the right direction (i.e. Towards the lockscreen widgets)
Navigation bar buttons customization
Quick settings: use hasTorchPackage, rather than supportsLED
Follow up 6b77eb7330bb3833d1c62b5b40e160bfaaa09c30