Added "AUDIO" and "BLOG" service types.

BLOG_POST and BLOG_COMMENT are using values 777 and 778 as these were the values used in Qora.

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

@@ -37,7 +37,9 @@ public class ArbitraryTransactionData extends TransactionData {
 		GIT_REPOSITORY(300),
 		IMAGE(400),
 		VIDEO(500),
-		DOCUMENT(600),
+		AUDIO(600),
+		DOCUMENT(700),
+		BLOG(700),
 		BLOG_POST(777),
 		BLOG_COMMENT(778);