Keep recordTypes a set until we actually need to turn it into a list


git-svn-id: https://svn.calendarserver.org/repository/calendarserver@13535 e27351fd-9f3e-4f54-a53b-843176b1656c
Get latest twext


git-svn-id: https://svn.calendarserver.org/repository/calendarserver@13536 e27351fd-9f3e-4f54-a53b-843176b1656c