Merge pull request #4611 from capilkey/implement-rights-management

...n/scala/org/bigbluebutton/core/apps/PermissionCheck.scala

...ton/core/apps/chat/ClearPublicChatHistoryPubMsgHdlr.scala

...gbluebutton/core/apps/layout/BroadcastLayoutMsgHdlr.scala

...n/core/apps/users/AddUserToPresenterGroupCmdMsgHdlr.scala

...luebutton/core/apps/users/AssignPresenterReqMsgHdlr.scala

...re/apps/users/ChangeLockSettingsInMeetingCmdMsgHdlr.scala

...luebutton/core/apps/users/ChangeUserEmojiCmdMsgHdlr.scala

...bluebutton/core/apps/users/ChangeUserRoleCmdMsgHdlr.scala

...tton/core/apps/users/EjectUserFromMeetingCmdMsgHdlr.scala

...ebutton/core/apps/users/LockUserInMeetingCmdMsgHdlr.scala

...button/core/apps/users/LockUsersInMeetingCmdMsgHdlr.scala

...utton/core/apps/users/LogoutAndEndMeetingCmdMsgHdlr.scala

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

...e/apps/users/RemoveUserFromPresenterGroupCmdMsgHdlr.scala

...button/core/apps/users/SetRecordingStatusCmdMsgHdlr.scala

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