state -> queryState change just landed on master

[Bron Gondwana]

Just pushed a change to master (and cassandane) changing the "state" to
"queryState" for all query and queryChanges JMAP methods, as per latest
spec draft.
Bron.

--
  Bron Gondwana, CEO, FastMail Pty Ltd
  br...@fastmailteam.com