Added "lite" setting to designate the core as a lite node.

src/main/java/org/qortal/settings/Settings.java

@@ -143,6 +143,8 @@ public class Settings {
 	 * This has a significant effect on execution time. */
 	private int onlineSignaturesTrimBatchSize = 100; // blocks
 
+	/** Lite nodes don't sync blocks, and instead request "derived data" from peers */
+	private boolean lite = false;
 
 	/** Whether we should prune old data to reduce database size
 	 * This prevents the node from being able to serve older blocks */
@@ -796,6 +798,10 @@ public class Settings {
 		return this.onlineSignaturesTrimBatchSize;
 	}
 
+	public boolean isLite() {
+		return this.lite;
+	}
+
 	public boolean isTopOnly() {
 		return this.topOnly;
 	}