Frameworks: rework navbar and statusbar transparency/color handling (1/2)

All current implemented versions of nav and statusbar transparency
which are around are not really perfect and all have downsides. After I saw the
implementation from Romanb (thanks) I got an idea to solve especially
the problem on keyguard without forcing the user to set for keyguard
seperatly a transparency to have a good result. Main problem is that
aosp does not allow to overlay the navbar with a shadow.

This commit does:

- introduce central TransparencyManager (thanks Roman)
- introduce a layerDrawable with a ColorDrawable as overlay and underlay
  to get consistent results on keyguard to show the shadow
- introduce a overlay to animate the navbar shadow like the PIE background shadow
  when the user is not in expanded mode. So the user get the whole screen darken (or colored).
- get complete rid of backgroundalphadrawable class
- allow colorize of theme (theme engine) navbar/status bar background changes
  reset to default shows as usual the theme without manipulation
- expand the custom background area on lockscreen behind the statusbar
  (navbar AOSP does not allow)

- default wallpaper and full transparent mode is now completly consistent and nice
  looking on every possible setting.
- full color lockscreen reflects the color now behind the navbar
  to imitate same behaviour like the default wallpaper on lockscreen. As well
  now consistent and nice looking on every possible setting.
- lockscreen background image mode is the only one where a 100% consistent solution
  is not possible due that the image is always smaller on lockscreen (not expandable behind
  navbar) and I do not see a good way to put in the underlay a partly image in a nice way
  ...to avoid weird transparency draws the transparency on navbar
  is set to the chosen lockscreen background transparency as long the lockscreen transparency
  is smaller then the navbar/statusbar transparency. Todo: notify in settings the user about
  the behaviour change so that it is no surprise.
- add multiuser compatibility to serveral vars
- margin fix on lockscreen
- hide statusbar on lockscreen on expanded or autohide statusbar mode
- add option to unlink colorizing on apps
- optimizing and a memory leak fix
- cleanup

Change-Id: I22ccfc5d3fff58b266848b2e0983435094ba6847

Conflicts:
	core/java/android/provider/Settings.java
	packages/SystemUI/src/com/android/systemui/statusbar/BaseStatusBar.java
	packages/SystemUI/src/com/android/systemui/statusbar/phone/PhoneStatusBarView.java
Frameworks: recreate navbar and statusbar background only when needed

means only on theme changes

Change-Id: I36d31e79eeaade29cbad2bfffdc647fd5c846d69
Frameworks: move complete keyevents into SlimActions

still to lazy to doe the HW key rebinding revamp but we need
this move as well for that and it is from codeview much cleaner

This commit does:
- move all key event actions into SlimActions
- get rid off ExtensableKeyViewButton class and handle all over
  the AOSP KeyViewButton class which is now reverted nearly to the aosp
  one with slight modifications for the key handling
- fix the double vibrations on home, back and recents
- fix double sound on menu action on PIE and navbar permanent menu buttons
  due that the click sound is played by PhoneWindow.java for ActionBar events
  we do not play our sound for this action
- cleanup a lot unused imports

Change-Id: I7f1862e0e43654837fce4f4085d1ab9aef0558df

Conflicts:
	core/java/com/android/internal/util/liquid/LiquidActions.java
	packages/SystemUI/src/com/android/systemui/SearchPanelView.java
	packages/SystemUI/src/com/android/systemui/statusbar/policy/ExtensibleKeyButtonView.java
	packages/SystemUI/src/com/android/systemui/statusbar/policy/PieController.java
Frameworks: add Accessibility events to navbar, pie and navring

for click and longpress actions

Change-Id: Iea536ec43cbad9f2c26e0ab52a89f7d2c700f149

Conflicts:
	packages/SystemUI/src/com/android/systemui/SearchPanelView.java
	packages/SystemUI/src/com/android/systemui/statusbar/policy/PieController.java
Framewors: add expanded dektop to SlimActions (1/2)

which is then available for PIE, navbar and navring and later
for HW keys

Change-Id: I00ebf30c75aa1b2980c2e41ce1464ee5b63e6f83

Conflicts:
	core/res/res/values/strings.xml