Allowed non-standard "SUBTITLE" as an alias for "SUBTITLE" when deserializing TrackSubType

Author: Nadahar

src/main/java/org/digitalmediaserver/cast/message/enumeration/TrackSubType.java

@@ -15,13 +15,15 @@
  */
 package org.digitalmediaserver.cast.message.enumeration;
 
+import com.fasterxml.jackson.annotation.JsonAlias;
 
 /**
  * The type of text track. For text tracks only.
  */
 public enum TrackSubType {
 
 	/** Subtitles track */
+	@JsonAlias("SUBTITLE")
 	SUBTITLES,
 
 	/** Captions track */