subscribe for -DESKSHARE in meeting, adjust for liveMeeting

...n/java/org/bigbluebutton/core/api/IBigBlueButtonInGW.java

...ain/scala/org/bigbluebutton/core/BigBlueButtonActor.scala

...main/scala/org/bigbluebutton/core/BigBlueButtonInGW.scala

...s/src/main/scala/org/bigbluebutton/core/LiveMeeting.scala

.../src/main/scala/org/bigbluebutton/core/MeetingActor.scala

.../src/main/scala/org/bigbluebutton/core/MeetingModel.scala

.../test/scala/org/bigbluebutton/core/AppsTestFixtures.scala

akka-bbb-fsesl/fs_conf_files/conf/dialplan/default.xml

akka-bbb-fsesl/fs_conf_files/conf/dialplan/public.xml

...ebutton/freeswitch/voice/freeswitch/ESLEventListener.java

...org/bigbluebutton/freeswitch/VoiceConferenceService.scala