QS: Add loading when toggling state, and longpress brightness

Change-Id: Ifa133e15259b45da4c625ce47b3f12209bcd1b94

Conflicts:
	packages/SystemUI/src/com/android/systemui/statusbar/phone/QuickSettings.java
	packages/SystemUI/src/com/android/systemui/statusbar/phone/QuickSettingsTileView.java

Conflicts:
	packages/SystemUI/src/com/android/systemui/statusbar/phone/QuickSettingsTileView.java
QS: Add flippable tiles

This commit adds support for tiles that can be flipped to reveal
more information, as well as a two flippable tiles:
 - A Wi-Fi back tile displaying the current IP address in case
   you're connected to a Wi-Fi network. Tapping the back of the
   tile opens the tethering settings, if supported.
 - A Bluetooth back tile displaying the number of paired devices,
   and tapping it toggles discoverability.

This commit also moves the loading spinner to the BasicTile, as
it is only supported in basic_tile layout.

Change-Id: Ic08b08a97c3dd999b1915c7bb108c850a2cbcd9b

Conflicts:
	packages/SystemUI/src/com/android/systemui/statusbar/phone/QuickSettings.java
	packages/SystemUI/src/com/android/systemui/statusbar/phone/QuickSettingsBasicTile.java
	packages/SystemUI/src/com/android/systemui/statusbar/phone/QuickSettingsTileView.java

Conflicts:
	packages/SystemUI/src/com/android/systemui/statusbar/phone/QuickSettings.java
Navigation Bar: Toggle last app on recents button long press

Change-Id: I1e6d6255494991b440f3cf5854a7edad7fee2c1b

Conflicts:
	packages/SystemUI/src/com/android/systemui/statusbar/BaseStatusBar.java
	packages/SystemUI/src/com/android/systemui/statusbar/phone/PhoneStatusBar.java
Settings: add HEADSET_CONNECT_PLAYER key

Change-Id: I1250d44fdde7f6d508ac6e49c4c6bb85c9f66233

Conflicts:
	core/java/android/provider/Settings.java
Settings: Add Blacklist storage

Change-Id: I963d8322bc5af3313cf960a0343163382f8d125b

Conflicts:
	core/java/android/provider/Settings.java
base: Add a key combo to start/stop video recording

Press volume up and power to start recording a video of your screen.
Press this key combo again to stop it.

Change-Id: Id0b13ba1092a1d6e0bf7bff5f14d89764cdf370c