Settings: statusbar clock customization + initial interface + color picker

- added slims clock and date customizations for status bar
- added our own modded marginov color picker which we use as default
- added initial interface settings. A bit empty currently but we are on
  alpha and it will be filled fast for sure. Added as well two empty classes
  due that we need them later

This commit include the following commit:

https://github.com/SlimRoms/packages_apps_Settings/commit/b8c81dd55d2ca7f055fd6396c8a23198d159fcd6

PS1: Initial

Change-Id: I35690a93fed0b7e43649f1b3755f905ee9e2562b