Also, fixes crashes when entering tag and threads due to me forgetting to implement the interfaces required by the code that removes posts from timelines when blocking/muting.
Also fixes a small bug where for mentions of users from other instances, clicking on the mention would open the profile in the browser instead of in-app.
-One where deletion causes statuses to lose track of where they are in timelines, so subsequent deletion and other actions are performed on the wrong status.
-It's was possible to infinitely open copies of the same thread, account page, and tag page by just continuously clicking on the status, avatar, or hash tag respectively.
Mentions are also, incidentally, but still link to the account page for that user in the browser. This should be changed to an in-app account page when that's finished, but it's actually fairly suitable fallback behaviour for now.
