Frameworks: percentage text charging indicator and custom color (1/2)

Due some user complains cause of missing charging indicator on
battery percentage and percentage+icon in statusbar this commit
introduces two features

- percentage/percentage + icon color indicator on charging
  (default color = green)
- custom charging color for all battery symbols with percentage text
  (percentage/percentage+icon/circle with percentage/dotted circle with percentage

- a bit code cleanup

cheers

Change-Id: I1e3e00085f5f3c0ca069771da7bb6fa43fa7f024