Add a circlular memory indicator to the recent panel view (1/2)

Originally picked from Chameleon OS
http://goo.gl/vgL71x

Modifications:
It allows to be toggled on/off as well as setting a custom location.

Colors are not solid, they have an alpha channel to provide
transparency, this way it doesnt interfer much with the recents
panel view.

Screenshot:
http://goo.gl/Th7g0j

OmniGears Part:
https://gerrit.omnirom.org/#/c/3057/

Change-Id: I07999d476a16d24ddf9c6de441ae646887da8074

Conflicts:
	core/java/android/provider/Settings.java
	packages/SystemUI/res/layout-land/status_bar_recent_panel.xml
	packages/SystemUI/res/layout/status_bar_recent_panel.xml
	packages/SystemUI/src/com/android/systemui/recent/RecentsPanelView.java