This requires the notifier to have knowledge of appservice listeners so it can
do the regex checks on incoming invites to see if the state_key matches. It
isn't enough to just rely on the room listeners and store.get_app_service_rooms
as the room will initially not exist or won't be on the ASes radar due to
having none of its users in the room.

Fallback registration page: make the page autoresize on iPhone Safari/Webview

Fallback registration page: added the classic viewport meta to fix the display on iPhone Safari and webview. The width of input elements also needs to be fixed.

Registration fallback

Pull the _get_event_cache.setdefault() call out of the try block, as it doesn't need to be there and is confusing

Try to keep both forms of registration logic (native/fallback) close
together for sanity.