SystemUI: Bring back good ol' circle battery style

Drawable java implementation inspired by Ian and Danesh's work on
the old forward ports:

Author: Ian Roy <ian.t.roy@gmail.com>
Co-author: Danesh M <daneshm90@gmail.com>
Date:   Tue Oct 27 18:19:02 2015 -0700

    BatteryMeterDrawable: add battery styles

    Change-Id: Icfc14d989eebde9014538291c24aa76d328df234

Author: camcory <camcory1@gmail.com>
Date:   Mon Aug 13 14:03:14 2018 -0400

    Add the powersave hint to the circle battery

    Change-Id: I00443130c758397a8a288b5f23ddfd824d778e38

Partially squashed with:

Author: Hendrik Hagendorn <git@finnq.de>
Date:   Sun Jan 15 08:47:10 2017 +0100

    SystemUI: Refactor battery icon options

    * Use the icon blacklist for hiding
    * Combine options for hiding status bar icons in system tuner settings

    Change-Id: I3924bae6c2f65015ed9b6e3e4038a1fc36951867

Change-Id: I5c1cfec6d08deb6f4205356dd2bbc03e04d0ee3a