Fix typo when checking if user is invited to group

Add comment about attestations

Device deletion: check UI auth matches access token

Allow ASes to deactivate their own users

This helps ensure that the renewals of attestations are spread out more
evenly.

Add is_public to groups table to allow for private groups

Front-end proxy: pass through auth header

Support /keys/upload on /r0 as well as /unstable

Fix logcontext leaks in httpclient

Add logging and fix log contexts for publicRooms

(otherwise there's no point in the UI auth)

Fix error when running synapse with no logfile

So that access-token-in-an-auth-header works.

(So that we can stop riot relying on it in /unstable)

`preserve_context_over_fn` is borked

Sometimes we need to pass headers into these methods

Adding a column with non-constant default not possible in sqlite3