fix meeting mute and disable unmute of others

...rg/bigbluebutton/core/apps/users/MuteUserCmdMsgHdlr.scala

...utton/core/apps/voice/UserJoinedVoiceConfEvtMsgHdlr.scala

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

...ton/core2/message/handlers/IsMeetingMutedReqMsgHdlr.scala

.../message/handlers/MuteAllExceptPresentersCmdMsgHdlr.scala

...button/core2/message/handlers/MuteMeetingCmdMsgHdlr.scala

.../scala/org/bigbluebutton/common2/msgs/VoiceConfMsgs.scala

bigbluebutton-client/locale/en_US/bbbResources.properties

bigbluebutton-client/resources/config.xml.template

...ent/src/org/bigbluebutton/main/model/users/UserService.as

...src/org/bigbluebutton/modules/users/model/UsersOptions.as

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

...org/bigbluebutton/modules/users/services/MessageSender.as

.../bigbluebutton/modules/users/views/MediaItemRenderer.mxml

...rc/org/bigbluebutton/modules/users/views/UsersWindow.mxml