HALO bugfixes

- couple of problems with concurrent threads
- green batch only for nap
- italics gone
- mdpi and & hdpi icons
- statusbar-icon gaps
- flipping batch when content changes
- batch fadeout without flip
- code style

Change-Id: Idfb145eb8e220bf224dd3d0e235e3647dcc82ed9

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

Conflicts:

	packages/SystemUI/res/drawable-xhdpi/halo_pinned_app.png
	packages/SystemUI/res/drawable-xhdpi/halo_system_message.png
	packages/SystemUI/src/com/android/systemui/statusbar/halo/Halo.java
	packages/SystemUI/src/com/android/systemui/statusbar/halo/HaloProperties.java