Add clock styles and Clock color picker

This commit is a combination of CM, AOKP and SlimROMs work

features:

- Clock and date enable/disable
- Clock and date position
- AM/PM styles multilang support
- Fully customizable date in style and format
- Fully dynamic settings

Change-Id: I588e7e78821e9b8fc2cd001c4858716d9700cc8e