Auto-join rooms

[KB1RD]

Currently, I have to log in to Corporal's account and join rooms if they're invite-only. It would be nice if Matrix Corporal would auto-join rooms when invited if the room is in managedRoomIds. This could be done by constantly syncing to find new invites, but that seems like it would waste CPU since every sent message would be sent to Matrix Corporal. I think that the fastest way to do this is to poll the server when managedRoomIds changes and with a fixed time (in case any are missed), but I really don't know how Matrix Corporal is structured.