Remove GObject from Dispatcher hierarchy

server/dispatcher.cpp

server/dispatcher.h

server/main-channel-client.cpp

server/main-dispatcher.cpp

server/main-dispatcher.h

server/red-channel.cpp

server/red-channel.h

server/red-client.cpp

server/red-qxl.cpp

server/red-stream.cpp

server/red-worker.cpp

server/reds.cpp

server/video-stream.cpp