feat(hydra): Initial public commit for v12 support

# Conflicts:
#	src/core/info/room_version.rs
#	src/service/rooms/timeline/create.rs

# Conflicts:
#	Cargo.lock
#	src/core/matrix/state_res/event_auth.rs

# Conflicts:
#	Cargo.toml

src/api/client/sync/v3.rs

@@ -457,7 +457,7 @@ async fn handle_left_room(
 			state_key: Some(sender_user.as_str().into()),
 			unsigned: None,
 			// The following keys are dropped on conversion
-			room_id: room_id.clone(),
+			room_id: Some(room_id.clone()),
 			prev_events: vec![],
 			depth: uint!(1),
 			auth_events: vec![],