Merge branch 'hangout-style' into camera-hints

...rg/bigbluebutton/conference/BigBlueButtonApplication.java

...luebutton/conference/ParticipantUpdatingRoomListener.java

...apps/src/main/java/org/bigbluebutton/conference/Room.java

.../main/java/org/bigbluebutton/conference/RoomsManager.java

...igbluebutton/conference/service/chat/ChatApplication.java

...rg/bigbluebutton/conference/service/chat/ChatHandler.java

...bluebutton/conference/service/chat/ChatMessageSender.java

...a/org/bigbluebutton/conference/service/chat/ChatRoom.java

...gbluebutton/conference/service/chat/ChatRoomsManager.java

...rg/bigbluebutton/conference/service/chat/ChatService.java

...n/conference/service/messaging/RedisMessagingService.java

...ference/service/participants/ParticipantsApplication.java

...ference/service/participants/ParticipantsEventSender.java

.../conference/service/participants/ParticipantsHandler.java

.../conference/service/participants/ParticipantsService.java

...ervice/presentation/ConversionUpdatesMessageListener.java

...ference/service/presentation/PresentationApplication.java

...ference/service/presentation/PresentationEventSender.java

.../conference/service/presentation/PresentationHandler.java

...ton/conference/service/presentation/PresentationRoom.java