Move out all the memory measurement to a separate class that can cache
all of its data through orientation changes.
Tweak the display to make it draw large squares for the legend instead
of a 1x1 square. Add padding to the percentage bar chart.
Change-Id: I4cd5bc4ba31a422a55740e8f58e5e571cf9866a5
Also clean up to remove dead code for running services and old
battery usage UI.
Finally some string improvements from Roy.
Change-Id: I8765a4c744b92edd1505f14c47fea57b918e5d7b
