[2/2] SystemUI: Add percent only and none options for battery icon

PS3: Add an option for percent next to battery bar
also changed implementation to use a textview as this is much cleaner
Implemented percent color change on critical and low battery levels.

PS4: Adjust to STATUS_BAR_BATTERY_STYLE numbering changes
Add percent to back of battery qs tile
Add percent battery to statusbar transitions.

PS5: Make battery bar default in qs tile when "none" is selected.
Make the percent size match clock size

Change-Id: I3c9c3820389d5073b1fa901cd2008bc685840a63