Keaguard: enable translucent keyguard by default

currently it is possible to enable it per device over an overlay and it is disabled
by default. Enable it by default but respect general transluscent disable from
device tree. Manta eg disables this feature due of graphical glichtes.

Change-Id: I3579d47ee3bee05719ef357ffcf19c0137b2302f
Notification drawer custom background & notification rows transparency (1/2)

Change-Id: Id1509362dc4bd63c6553334c862c7d101af41b10

Conflicts:

	core/java/android/provider/Settings.java
Re-add auto brightness configuration UI (1/2)

- Add a button into the new brightness dialog that allows opening the
  auto brightness setup
- Enable auto-brightness adjustment (setting for general brighter/darker
  adjustment) and twilight adjustment

Change-Id: I7fd11ddaa112396dcb7508692aacb93bfe3da256
Customizable Low battery pop-up warning (1/2)

Change-Id: Iacd26b4b111f853853adeaf900c762313aa3e056

Conflicts:

	core/java/android/provider/Settings.java
Revert "Re-add auto brightness configuration UI (1/2)"

This reverts commit 6a4b85073b200d0e592fa543603fa09ce51b3b4e.