[AIR] display the first webcam stream

clients/flash/air-client/src/css/hdpi.css

clients/flash/air-client/src/css/ldpi.css

clients/flash/air-client/src/css/mdpi.css

clients/flash/air-client/src/css/xhdpi.css

clients/flash/air-client/src/css/xxhdpi.css

clients/flash/air-client/src/css/xxxhdpi.css

...lient/src/org/bigbluebutton/air/common/views/VideoView.as

...r-client/src/org/bigbluebutton/air/main/views/MainView.as

...lient/src/org/bigbluebutton/air/main/views/MenuButtons.as

...air-client/src/org/bigbluebutton/air/video/VideoConfig.as

...-client/src/org/bigbluebutton/air/video/models/Webcams.as

...lient/src/org/bigbluebutton/air/video/views/WebcamDock.as

...c/org/bigbluebutton/air/video/views/WebcamDockMediator.as

...luebutton/air/video/views/swapcamera/ISwapCameraButton.as

...bluebutton/air/video/views/swapcamera/SwapCameraButton.as

...uebutton/air/video/views/swapcamera/SwapCameraMediator.as