Added "THUMBNAIL" and "PLAYLIST" service types, and fixed a duplicate issue in earlier commit.

Thumbnails will be used in order to show logos/screenshots in the list of websites or other resources. Playlists will allow for media apps to group videos/audio/images into collections, e.g. albums.

src/main/java/org/qortal/data/transaction/ArbitraryTransactionData.java

@@ -36,12 +36,14 @@ public class ArbitraryTransactionData extends TransactionData {
 		WEBSITE(200),
 		GIT_REPOSITORY(300),
 		IMAGE(400),
+		THUMBNAIL(410),
 		VIDEO(500),
 		AUDIO(600),
-		DOCUMENT(700),
 		BLOG(700),
 		BLOG_POST(777),
-		BLOG_COMMENT(778);
+		BLOG_COMMENT(778),
+		DOCUMENT(800),
+		PLAYLIST(900);
 
 		public final int value;