Process system updates:

All processes:
- Added process status system and relevant API calls
- Added ability to set track masks for input/output in processes
- Added support for unmasking tracks when there is a push target, by the "unmask" parameter.
- Added track unmasking support for processes on exit/error
- Make processes start faster, if possible, in the first few seconds of a stream
- Delay stream ready state if there are processes attempting to start

Livepeer process updates:
- Added Content-Resolution header to MistProcLivepeer as per Livepeer's request
- Renamed transcode from "Mist Transcode" to source stream name
- Added ability to send audio to livepeer
- Robustified livepeer timing code, shutdown code, and improved GUI
- Prevent "audio keyframes" from starting segments in MistProcLivepeer
- Multithreaded (2 upload threads) livepeer process
- Stricter downloader/uploader timeout behaviour
- Robustness improvements
- Fix small segment size 😒
- Streamname correction
- Prevent getting stuck when transcoding multiple qualities and they are not equal length
- Corrected log message print error
- Race condition fix
- Now always waits for at least 1 video track

src/output/output.cpp

@@ -112,6 +112,7 @@ namespace Mist{
     }
     if (isRecording() && DTSC::trackValidMask == TRACK_VALID_EXT_HUMAN){
       DTSC::trackValidMask = TRACK_VALID_EXT_PUSH;
+      if (targetParams.count("unmask")){DTSC::trackValidMask = TRACK_VALID_ALL;}
     }
     /*LTS-END*/
   }
@@ -1721,7 +1722,7 @@ namespace Mist{
       std::string APIcall =
           "{\"tag_sessid\":{\"" + statComm.getSessId() + "\":" + JSON::string_escape("UA:" + UA) + "}}";
       Socket::UDPConnection uSock;
-      uSock.SetDestination("localhost", 4242);
+      uSock.SetDestination(UDP_API_HOST, UDP_API_PORT);
       uSock.SendNow(APIcall);
       newUA = false;
     }