Toggle to switch recent panels styles (1/2)
- Allows us to switch between Stock or Slim recent panles;
- Made TRDS work in theme changes;
- Some minor codes improvments;

This was based on: https://github.com/AOSB/android_frameworks_base/commit/dbb5540884826786bfec9f7ea42a515a09c4094e
Thanks @codex-corp

Change-Id: Ie4c7497de93f1cbdec077657c21bed3766043187

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

Conflicts:
	core/java/android/provider/Settings.java
	packages/SystemUI/src/com/android/systemui/statusbar/BaseStatusBar.java
fix dup error

Change-Id: I07c4fde4d6007e5e6981dcad526a0d9ae4020739
Serp

Change-Id: If997fdb6994f2b384ee725455c456911b738853a