Set up the user filter
An MRE.Context object, or another user filter instance
The set of joined users
Process an input event only from users that pass the filter
Deregister an onUserJoined callback
Deregister an onUserLeft callback
Register a callback that will be called when a user that passes the filter joins the MRE session
Register a callback that will be called when a user that passes the filter leaves the MRE session
Base class for classes that filter out users from MRE awareness