Frameworks: Add option to enable activity indicators on status bar (1/2)

Change-Id: I7aa85f7c8442c45d17e42cac7823dfe93e3f24c1

Patchset: 20
https://gerrit.omnirom.org/#/c/2509/

Conflicts:
	core/java/android/provider/Settings.java
	packages/SystemUI/src/com/android/systemui/statusbar/policy/NetworkController.java