Disabled all arbitrary data manager threads if QDN is disabled in the settings.

src/main/java/org/qortal/controller/arbitrary/ArbitraryDataCleanupManager.java

@@ -79,6 +79,12 @@ public class ArbitraryDataCleanupManager extends Thread {
 			while (!isStopping) {
 				Thread.sleep(30000);
 
+				// Don't run if QDN is disabled
+				if (!Settings.getInstance().isQdnEnabled()) {
+					Thread.sleep(60 * 60 * 1000L);
+					continue;
+				}
+
 				Long now = NTP.getTime();
 				if (now == null) {
 					// Don't attempt to make decisions if we haven't synced our time yet

src/main/java/org/qortal/controller/arbitrary/ArbitraryDataManager.java

@@ -74,6 +74,12 @@ public class ArbitraryDataManager extends Thread {
 			while (!isStopping) {
 				Thread.sleep(2000);
 
+				// Don't run if QDN is disabled
+				if (!Settings.getInstance().isQdnEnabled()) {
+					Thread.sleep(60 * 60 * 1000L);
+					continue;
+				}
+
 				List<Peer> peers = Network.getInstance().getHandshakedPeers();
 
 				// Disregard peers that have "misbehaved" recently

src/main/java/org/qortal/controller/arbitrary/ArbitraryDataStorageManager.java

@@ -73,6 +73,12 @@ public class ArbitraryDataStorageManager extends Thread {
             while (!isStopping) {
                 Thread.sleep(1000);
 
+                // Don't run if QDN is disabled
+                if (!Settings.getInstance().isQdnEnabled()) {
+                    Thread.sleep(60 * 60 * 1000L);
+                    continue;
+                }
+
                 Long now = NTP.getTime();
                 if (now == null) {
                     continue;