First pass at YP registration/configuration (#209)

* Spike: Ping YP service with instance details

* WIP: Add to the config to support YP

* Add YP response endpoint

* Handle YP errors. Use config. Off by default

* Show message about YP support on launch

* Add animated gif preview when generating thumb

* Increase quality of preview gif and only create it if YP is enabled

* Do not allow re-registration by clearing the key

* Make large and small logos actually structured

* Change log level

* Fix default YP service URL

* Point to default hostname

* Set default value for YP to false

core/status.go

@@ -38,6 +38,10 @@ func SetStreamAsConnected() {
 		chunkPath = config.Config.GetPrivateHLSSavePath()
 	}
 
+	if _yp != nil {
+		_yp.Start()
+	}
+
 	ffmpeg.StartThumbnailGenerator(chunkPath, config.Config.VideoSettings.HighestQualityStreamIndex)
 }
 
@@ -46,6 +50,10 @@ func SetStreamAsDisconnected() {
 	_stats.StreamConnected = false
 	_stats.LastDisconnectTime = utils.NullTime{time.Now(), true}
 
+	if _yp != nil {
+		_yp.Stop()
+	}
+
 	ffmpeg.ShowStreamOfflineState()
 	startCleanupTimer()
 }