Improves writing speed when not using a GUI

Uses buffered writers instead of System.out
Uses a GUI for writing JarBuilder messages
Adds some missing comments to the jar builder

src/main/java/net/knarcraft/minecraftserverlauncher/userinterface/MessageHandler.java

@@ -1,6 +1,9 @@
 package net.knarcraft.minecraftserverlauncher.userinterface;
 
 import javax.swing.*;
+import java.io.BufferedWriter;
+import java.io.IOException;
+import java.io.OutputStreamWriter;
 
 /**
  * This class handles displaying messages to the user
@@ -8,6 +11,7 @@ import javax.swing.*;
 public abstract class MessageHandler implements GUI {
 
     private final boolean silent;
+    private final BufferedWriter writer;
 
     /***
      * Initializes a new message handler
@@ -16,12 +20,18 @@ public abstract class MessageHandler implements GUI {
      */
     public MessageHandler(boolean silent) {
         this.silent = silent;
+        this.writer = new BufferedWriter(new OutputStreamWriter(System.out));
     }
 
     @Override
     public void showError(String title, String message) {
         if (silent) {
-            System.out.println(message);
+            try {
+                writer.write(message);
+                writer.flush();
+            } catch (IOException e) {
+                System.out.println(message);
+            }
         } else {
             showJOptionPane(title, message, JOptionPane.ERROR_MESSAGE);
         }
@@ -35,7 +45,12 @@ public abstract class MessageHandler implements GUI {
     @Override
     public void showMessage(String title, String message) {
         if (silent) {
-            System.out.println(message);
+            try {
+                writer.write(message);
+                writer.flush();
+            } catch (IOException e) {
+                System.out.println(message);
+            }
         } else {
             showJOptionPane(title, message, JOptionPane.INFORMATION_MESSAGE);
         }