Don't ignore the obey overlay if the rule has an enabled attribute of False

Fixes https://github.com/vector-im/vector-web/issues/1244

Add a replication stream for state groups

Use a stream id generator to assign state group ids

Require user to have left room to forget room

This dramatically simplifies the forget API code - in particular it no
longer generates a leave event.

Add new author

Support login using Javascript Web Tokens (JWT)

Deduplicate identical /sync requests

Never notify for member events.

Intern lots of strings

Don't require alias in public room list.