frameworks/base: Update quick launch shortcut icons/resources

Update the existing icons and add "xxhdpi" versions created
from a vector template. This commit cleans also the resource
files a bit up.

Screenshot: http://goo.gl/6CrMYr

Change-Id: I45abee5cf13cd239eb5b4402019afac28d6d5952
HeadsUp: Launch in floating window

Add some part of NotificationHelper
Credits to AOSPA team

Taken from:
https://github.com/lion0738/android_frameworks_base/commit/9e4b4b3bf10ccaee3ff64bb7b74f929210b85d69

Change-Id: I7001cebd69790b46b8dcfe9150c7ef104e5427a2
HeadsUp: option to launch in floating window [1/2]

Change-Id: Ia8ffb4088f5b48b222a77ef486ba8b14e193c26f
Add getBoolean