Merge pull request #4896 from prlanzarin/flash-webcam-fix

.gitignore

...button/core/apps/users/UserBroadcastCamStartMsgHdlr.scala

...in/scala/org/bigbluebutton/common2/msgs/WebcamsMsgs.scala

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

...mports/api/video/server/handlers/userSharedHtml5Webcam.js

...orts/api/video/server/handlers/userUnsharedHtml5Webcam.js

...html5/imports/api/video/server/methods/userShareWebcam.js

...ml5/imports/api/video/server/methods/userUnshareWebcam.js