Start implementing /join for room aliases for rooms the server is not in. (#115)

* Start implementing the join room API

* Hacks to get join room working

* Make the TLS fingerprint configurable

* Fix the client API proxy to handle '#' correctly

* Return a 200 OK response

* Write the join event along with current state to the room server

* Comment on the error handling

* Fix typos

* Fix tab

* Add TODO for moving authEventIDs to gomatrixserverlib

* Comment on why we ignore the key ID argument for local keys

* Avoid 'preceeded'

* Neaten the control flow

* Neaten the control flow even more

* Return pointers

* Rename err to lastErr for the loop

vendor/src/github.com/matrix-org/gomatrixserverlib/event.go

@@ -386,7 +386,7 @@ func (e Event) CheckFields() error {
 		// are allowed to have a different sender because they have the same
 		// sender as the "m.room.third_party_invite" event they derived from.
 		// https://github.com/matrix-org/synapse/blob/v0.21.0/synapse/event_auth.py#L58-L64
-		if e.fields.Type != "m.room.member" {
+		if e.fields.Type != MRoomMember {
 			return fmt.Errorf(
 				"gomatrixserverlib: sender domain doesn't match origin: %q != %q",
 				eventDomain, e.fields.Origin,