[2/2] OmniGears: more improve Active Display

1. fix http://jira.omnirom.org/browse/OMNI-651
2. fix http://jira.omnirom.org/browse/OMNI-641
3. add http://jira.omnirom.org/browse/OMNI-652
4. Add option Double tap to sleep every where
5. Add option to show and choose wallpaper behind active display
6. Allow to show numbers of notification on Handle
7. minor improvements
8. add battery circle around handle

PS8
string rework

PS9
recalc brightness to % value

Change-Id: Iceaae6eecbdd3dbce4347b2e3994272b10f3c490