DeskClock: Add '00' and '30' buttons to timer setup; disable not currently applicable buttons

Change-Id: Ia96412e0036a4196f6ae80b4f4350430f4fdf334
Remove text form menu on cities screen

On the alarms screen the add MenuItem was always showing and
without the text. On the cities screen it was showing ifRoom and
withText. Now both are always shown without text. This primarily
affects tablets.

Change-Id: I7c8af8d1d6fc081303cd32aff90a938df242cd24
ProGuard: Disable suport library warnings

Change-Id: I384f131cb5fe2c7970e3fdc57a5901c34d19393f