Merge pull request #11447 from antobinary/external-video-sync-lucas-amguirado73

...uebutton/core/apps/externalvideo/ExternalVideoApp2x.scala

...ore/apps/externalvideo/StartExternalVideoPubMsgHdlr.scala

...core/apps/externalvideo/StopExternalVideoPubMsgHdlr.scala

...re/apps/externalvideo/UpdateExternalVideoPubMsgHdlr.scala

...ton/core/pubsub/senders/ReceivedJsonMsgHandlerActor.scala

.../core/record/events/AbsractExternalVideoRecordEvent.scala

...on/core/record/events/StartExternalVideoRecordEvent.scala

...ton/core/record/events/StopExternalVideoRecordEvent.scala

...n/core/record/events/UpdateExternalVideoRecordEvent.scala

...n/scala/org/bigbluebutton/core/running/MeetingActor.scala

.../org/bigbluebutton/core2/FromAkkaAppsMsgSenderActor.scala

...org/bigbluebutton/endpoint/redis/RedisRecorderActor.scala

...la/org/bigbluebutton/common2/msgs/ExternalVideoMsgs.scala

bigbluebutton-html5/imports/api/external-videos/index.js

...html5/imports/api/external-videos/server/eventHandlers.js

...api/external-videos/server/handlers/startExternalVideo.js

.../api/external-videos/server/handlers/stopExternalVideo.js

...pi/external-videos/server/handlers/updateExternalVideo.js

...ebutton-html5/imports/api/external-videos/server/index.js

...utton-html5/imports/api/external-videos/server/methods.js