Add ability to Block Input from other Hosts on a session

Partner is requesting more control over secondary hosts that may be in a session. Current behavior allows all hosts that are in a session to have full control over the session. Ideally the partner would like to be able to control input settings for each of the other hosts like in a meeting session. Allow control from everybody or nobody function we currently employ may be a solution.

1. First host in the session should be the primary host.
2. Sharing options should be exposed through the host client menu for the primary host to allow control by everyone or noone
3. If the primary host drops from the session control of the session should roll to the second host to join the session.