Added support for MUC delegate interactions, additional features/identities for MUCs, and implementation of joiningRoom/destroyingRoom in CS's MUC delegate, and use of the new identity adding functionality.  Reviewer: Armando    Pending testing.

git-svn-id: http://svn.igniterealtime.org/svn/repos/openfire/trunk@10121 b35dd754-fafc-0310-a699-88a17e54d16e