This introduces a new filter construct called HybridFilter. This allows
filters to have different remote filter than local ones. For example,
adding kind0 to the remote for keeping profiles up to date on your
timeline, but only subscribing to kind1 locally.
Only home/contact filters use this feature for now.
Fixes: https://github.com/damus-io/notedeck/issues/995
Signed-off-by: William Casarin <jb55@jb55.com>
This is a fairly large rewrite which unifies our threads, timelines and
profiles. Now all timelines have a MultiSubscriber, and can be added
and removed to columns just like Threads and Profiles.
Signed-off-by: William Casarin <jb55@jb55.com>
