OmniGears: add generic color picker preference

Also fixes existing color pickers rotation handling

Change-Id: I7f3280517aeed9bc70edfbcd69a08e567a6a7366
OmniGears: add NumberPickerPreference

Change-Id: I53a28a3680c5fc19a1fdb2055945278e64a70cff
Merge pull request #9 from omnirom/android-4.4

同步自 omnirom android-4.4