Added user list serialization to LocalDB

* Added user list to LocalDB
* Removed client user from LocalDB constructor

src/main/java/envoy/client/ui/ChatWindow.java

@@ -86,7 +86,7 @@ public class ChatWindow extends JFrame {
 			@Override
 			public void windowClosing(WindowEvent evt) {
 				try {
-					localDB.saveToLocalDB();
+					localDB.save();
 					Settings.getInstance().save();
 				} catch (IOException e1) {
 					e1.printStackTrace();