Storing meeting duration

We were getting the duration with a Popcorn temporary instance. This was causing a slowly increase on the cpu usage, which could compromise the performance of long recordings.

disable padding on body to handle the case when the playback is embedded in a third party app with a header

There are some cases in which annotations does not appear. It needs more testing.

Deskshare has it own functions to set its aspect. We were causing wrong annotations positioning as well as wrong slide resizing.

function is_video_valid returns true if video is valid

- Created function "seySync( )" which sets the sync logic. Basically, we sync all medias when pausing the master video. We pause the master video when any video receives a waiting event, or when the master video is seeked. If necessary, we resume playing after the sync.

- Refactored when 'media-ready' event is fired.  We fire this event only when the medias receive a 'canplayall' event.

Basically we now allow two or more instances of the same transcoder's ID, since they are in different meetings

Stop any remaining transcoder used by the meeting. Useful for mediaSource transcoders.

Conflicts:
	akka-bbb-apps/src/main/scala/org/bigbluebutton/core/BigBlueButtonActor.scala
	akka-bbb-apps/src/main/scala/org/bigbluebutton/core/MeetingActor.scala
	akka-bbb-apps/src/main/scala/org/bigbluebutton/core/MessageSenderActor.scala

Conflicts:
	akka-bbb-apps/src/main/scala/org/bigbluebutton/core/apps/VoiceApp.scala

Conflicts:
	akka-bbb-apps/src/main/java/org/bigbluebutton/core/api/IBigBlueButtonInGW.java
	akka-bbb-apps/src/main/java/org/bigbluebutton/core/pubsub/receivers/MeetingMessageReceiver.java
	akka-bbb-apps/src/main/scala/org/bigbluebutton/core/BigBlueButtonInGW.scala
	akka-bbb-apps/src/main/scala/org/bigbluebutton/core/MeetingActor.scala
	akka-bbb-apps/src/main/scala/org/bigbluebutton/core/MeetingModel.scala
	akka-bbb-apps/src/main/scala/org/bigbluebutton/core/MessageSenderActor.scala
	akka-bbb-apps/src/main/scala/org/bigbluebutton/core/api/InMessages.scala
	akka-bbb-apps/src/main/scala/org/bigbluebutton/core/api/OutMessages.scala
	akka-bbb-apps/src/main/scala/org/bigbluebutton/core/api/ValueObjects.scala
	akka-bbb-apps/src/main/scala/org/bigbluebutton/core/apps/UsersApp.scala
	akka-bbb-apps/src/main/scala/org/bigbluebutton/core/apps/UsersModel.scala
	akka-bbb-apps/src/main/scala/org/bigbluebutton/core/apps/VoiceApp.scala
	akka-bbb-fsesl/src/main/java/org/bigbluebutton/freeswitch/voice/freeswitch/ESLEventListener.java
	akka-bbb-transcode/src/main/java/org/bigbluebutton/transcode/core/VideoTranscoderObserver.java
	akka-bbb-transcode/src/main/java/org/bigbluebutton/transcode/core/ffmpeg/FFmpegCommand.java
	akka-bbb-transcode/src/main/java/org/bigbluebutton/transcode/core/ffmpeg/FFmpegConstants.java
	akka-bbb-transcode/src/main/java/org/bigbluebutton/transcode/core/ffprobe/FFProbeCommand.java
	akka-bbb-transcode/src/main/java/org/bigbluebutton/transcode/core/processmonitor/ProcessMonitor.java
	akka-bbb-transcode/src/main/java/org/bigbluebutton/transcode/core/processmonitor/ProcessMonitorObserver.java
	akka-bbb-transcode/src/main/java/org/bigbluebutton/transcode/core/processmonitor/ProcessStream.java
	bbb-common-message/src/main/java/org/bigbluebutton/common/messages/Constants.java
	bbb-common-message/src/main/java/org/bigbluebutton/common/messages/MessageFromJsonConverter.java
	bbb-common-message/src/main/java/org/bigbluebutton/common/messages/MessagingConstants.java
	bbb-voice/src/main/java/org/bigbluebutton/voiceconf/messaging/Constants.java
	bbb-voice/src/main/java/org/bigbluebutton/voiceconf/messaging/IMessagingService.java
	bbb-voice/src/main/java/org/bigbluebutton/voiceconf/messaging/MessageReceiver.java
	bbb-voice/src/main/java/org/bigbluebutton/voiceconf/messaging/ReceivedMessageHandler.java
	bbb-voice/src/main/java/org/bigbluebutton/voiceconf/messaging/RedisMessagingService.java
	bbb-voice/src/main/java/org/bigbluebutton/voiceconf/red5/Service.java
	bbb-voice/src/main/java/org/bigbluebutton/voiceconf/sip/CallAgent.java
	bbb-voice/src/main/java/org/bigbluebutton/voiceconf/sip/CallAgentObserver.java
	bbb-voice/src/main/java/org/bigbluebutton/voiceconf/sip/GlobalCall.java
	bbb-voice/src/main/java/org/bigbluebutton/voiceconf/sip/SipPeer.java
	bbb-voice/src/main/java/org/bigbluebutton/voiceconf/sip/SipPeerManager.java
	bbb-voice/src/main/webapp/WEB-INF/bbb-redis-messaging.xml
	bbb-voice/src/main/webapp/WEB-INF/red5-web.xml

- Popcorn "onFrame" method runs around 6 times per second. That was unnecessary , causing the CPU work to significantly increase, and preventing the two videos (deskshare and webcam) to run together smoothly

- We only synchronize the medias if one of them fires a "waiting" event. If the user pauses the playback, we synchronize them as well.

Refactored shapes drawing

fix issue introduced by last commit, in which the full path of the deskshare video file was not provided in order to check if it was a valid video or not

Fix playback text

Fixed wrong font sizes and placement in playback so now they match the annotated text from the presentation

Fix start/stop webcam events for the intermediary video formats