Adds a Colors table to the db and updates events/cals tables

This adds provider support for the new set of APIs being added
for colors. Adds allowedAvailability and allowedAttendeeType
to the Calendars table. Also removes old code for handling event
specific time zones before the server supported it.

Cherry pick of https://android-git.corp.google.com/g/#/c/143430/

Change-Id: I2e28350338657641f8a736bcedfbc1df92f5a5fd
2 files changed