Merge users and chat list into a single participants list.

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

...h/air-client/src/org/bigbluebutton/air/chat/ChatConfig.as

...igbluebutton/air/chat/events/ChatRoomItemSelectedEvent.as

.../org/bigbluebutton/air/chat/models/ChatMessagesSession.as

.../org/bigbluebutton/air/chat/models/GroupChatChangeEnum.as

...org/bigbluebutton/air/chat/models/IChatMessagesSession.as

...rg/bigbluebutton/air/chat/services/ChatMessageReceiver.as

...org/bigbluebutton/air/chat/services/ChatMessageService.as

...g/bigbluebutton/air/chat/views/ChatRoomsItemRenderer.mxml

...src/org/bigbluebutton/air/chat/views/ChatRoomsMediator.as

...src/org/bigbluebutton/air/chat/views/ChatRoomsViewBase.as

.../org/bigbluebutton/air/participants/ParticipantsConfig.as

...ebutton/air/participants/models/CollectionActionResult.as

...ebutton/air/participants/models/CollectionUpdateAction.as

...bigbluebutton/air/participants/models/ParticipantTitle.as

...ebutton/air/participants/models/ParticipantsCollection.as

.../air/participants/views/ParticipantTitleItemRenderer.mxml

...bluebutton/air/participants/views/ParticipantsMediator.as

...bluebutton/air/participants/views/ParticipantsViewBase.as

.../air-client/src/org/bigbluebutton/air/user/UsersConfig.as