Implemented DBus methods for copying input to other sessions
Implemented methods which allow input to be copied to no other session and to all sessions. In addition, users can also select exactly which sessions to copy input to by passing a list of Session ids. Calling supporting method copyingSessions() on a session lists other sessions which are copying input from it. Calling supporting method feederSessions() on a session lists other sessions it is copying input from.
Edited by Theodore Wang