[1/2] Base: Option to enable Notification Light when screen is on

This makes it possible to let the Notification LED flash even when the screen is on

Change-Id: I58be9646cdc84d4765342a5ab45b4641c3d5daba
Base: fix statusbar brightness control gesture

see http://jira.omnirom.org/browse/OMNI-631

Change-Id: Ic4001fb0fc6b7e1fe813d74104e42f7d91351d1a
Base: Correct MV to mV on QS back battery tile

Change-Id: I835f28b432570ea14775f93030599cf8731e9b76