cLock: Add ability to change font and monochrome icon colors

This commit adds the ability to select individual colors for the
various panels of the cLock widget.  It will also apply the selected
color as an overlay on the alarm, weather condition (mono only)
and the calendar icons.

The colors supported are the standard Android 4.x Holo color set
with White, Black and Grey added.

IMHO a full color picker would be an overkill for this feature.

Change-Id: I621669f49c414b0bbd1236b9d0fb2f0c08e4beea