Added more scala worksheet to test breakout room feature.

akka-bbb-apps/scala/BreakoutRoom.sc

akka-bbb-apps/scala/JsonTest.sc

akka-bbb-apps/scala/TestWorksheet.sc

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

...gbluebutton/modules/users/views/BreakoutRoomSettings.mxml