Frameworks: go kitkat + style tweaks and follow googles color sheme

Googles color sheme on cards is

card: ffffff
aditional content: f5f5f5
background: e5e5e5

first two we did...background not. Follow the color sheme due it has a better contrast.

As well remove the non google rounded edges.

Allow drawing behin status and navigation bar if the bars are translucent

PS:
- due it is now a system window ensure that all other system windows are closed when opening recents.
PS
- minor tweaks
PS
- remove one unused flag
PS
- respect app system ui visibility status and reflect it for smoother experience
PS
- bring back TYPE_RECENT_OVERLAY window layouparams back to live. It was never documented
nor depreciated. Was used in the past for GB recents and is even updated till today although
nothing in the system is using it.

Make it fully functionall (it is basically just an extended TYPE_SYSTEM_DIALOG) and allow
this window type to extend its content behind navigation bar.

PS
- minor fix...init the systemUI flags for the view allready on preload to prevent positioning
of the listview.
PS
- draw always behind navigation bar as long it is not immersive mode or hide navigation bar mode
- add more margin to the delete icon for kill all

Change-Id: If38036dded961fcf0a6d8c2e7d2ba44a8e1dd08a

Conflicts:
	core/java/android/view/IWindowManager.aidl
	packages/SystemUI/res/drawable-holodark-hdpi/recent_bg_dropshadow.9.png
	packages/SystemUI/res/drawable-holodark-mdpi/recent_bg_dropshadow.9.png
	packages/SystemUI/res/drawable-holodark-xhdpi/recent_bg_dropshadow.9.png
	packages/SystemUI/res/drawable-holodark-xxhdpi/recent_bg_dropshadow.9.png
	packages/SystemUI/src/com/android/systemui/slimrecent/RecentController.java
	services/java/com/android/server/wm/WindowManagerService.java