… by waiting for the corresponding event confirming the action. Affects:
* Creating a room
* (Re-)Joining a room
* Leaving a room
* Accepting an invitation
* Rejecting an invitation
This includes a few not-strictly-related changes that made sense to do at the
same time:
* Check for a functioning homeserver via get_supported_versions regardless of
whether a homeserver URL or user ID was supplied
* Rename use_discovery_response to respect_login_well_known
* Small appservice documentation improvement because those docs had to be
touched anyways
* Some test refactorings in tests that had to be touched anyways
Damir Jelić