Improve guest management settings window.

bigbluebutton-client/branding/default/style/css/V2Theme.css

...org/bigbluebutton/common/events/SettingsComponentEvent.as

...on-client/src/org/bigbluebutton/core/model/LiveMeeting.as

...-client/src/org/bigbluebutton/core/model/MeetingStatus.as

...tton-client/src/org/bigbluebutton/main/events/BBBEvent.as

...-client/src/org/bigbluebutton/main/views/BBBSettings.mxml

...src/org/bigbluebutton/main/views/GuestSettingsWindow.mxml

...rc/org/bigbluebutton/main/views/MainApplicationShell.mxml

...-client/src/org/bigbluebutton/main/views/MainToolbar.mxml

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