Add MySQL field for owner_password
Implement owner password auth
Owner passwords are salt+sha256 hashed (unlike join password) as they do not need cleartext access
For now, you also have to set a join password if you want to be able to auth as an owner
Need to implement a password popup if there's an owner password but no join password
Add an auth form in the join template
Lets you authenticate as the room owner even if there's no join pasword