* Generate m.room.canonical_alias instead of legacy m.room.aliases
* Add omitempty tags
* Add aliases endpoint to client API
* Check power levels when setting aliases
* Don't return null on /aliases
* Don't return error if the state event fails
* Update sytest-whitelist
* Don't send updated m.room.canonical_alias events
* Don't check PLs after all because for local aliases they are apparently irrelevant
* Fix some bugs
* Allow deleting a local alias with enough PL
* Fix some more bugs
* Update sytest-whitelist
* Fix copyright notices
* Review comments
