INT-2830/INT-2829 Fix S101 Tangles (Core, TCP)

__INT-2830 Resolve Class Tangle__
    
MessageGroupStore <-> MessageGroupCallback
    
Change callback to be an inner interface of the MGS.

__INT-2829 Fix Class Tangle in IP Module__
    
3 way tangle between TcpSender, TcpConnection, TcpMessageMapper
    
Clean up interfaces (remove setters); add top-level support
classes for TcpConnection, TcpConnectionInterceptor.

__INT-2829 Remove TCP Package Tangle__
    
    tcp.connection <-> tcp.connection.support
    
Remove ...connection.support package - move classes
to ...connection.