RoomUpdate came from a time where we had no data model for
SyncUpdates but now we have and therefore this class is just
code duplication. This removes the class
and uses the SyncRoomUpdate class from
the package matrix_api_lite instead.
It needed a lot of refactoring at some places
where I also have removed some unnecessary null or type checks.
We have used some data models which were only used in moor in the tests.
I needed to rewrite them in the original data as well.
Also now the "fake database" on native is the same like on web now with hive.