work on displaying rtmp stream in the client

...org/bigbluebutton/red5/client/DeskShareMessageSender.java

...bigbluebutton/modules/deskshare/events/ViewStreamEvent.as

...bluebutton/modules/deskshare/managers/DeskshareManager.as

...ebutton/modules/deskshare/managers/ViewerWindowManager.as

...gbluebutton/modules/deskshare/maps/DeskshareEventMap.mxml

.../modules/deskshare/view/components/DesktopViewWindow.mxml

...g/bigbluebutton/modules/users/services/MessageReceiver.as