Remove some we don't care about. Set some other ones we do care
about but don't currently adhere to to warn. Set the max warnings
threshold to the current number of warnings, so we don't introduce
more of them. Fix a bunch of legit lint errors and add exceptions
to various places in the test code that does funny things with
'this'.
In TimelineWindow.paginate, keep a count of the number of API requests we have
made, and bail out if it gets too high, to ensure that we don't get stuck in a
loop of paginating right back to the start of the room.
