Add JD icons

Author: emmanue1

app/src/main/java/org/jd/gui/view/MainView.java

@@ -27,6 +27,7 @@
 import java.awt.event.*;
 import java.io.*;
 import java.net.URI;
+import java.util.Arrays;
 import java.util.List;
 import java.util.Map;
 import java.util.function.Consumer;
@@ -83,7 +84,7 @@ public MainView(
         // Build GUI
         invokeLater(() -> {
             mainFrame = new JFrame("Java Decompiler");
-            mainFrame.setIconImage(getImage("/org/jd/gui/images/jd_icon_128.png"));
+            mainFrame.setIconImages(Arrays.asList(getImage("/org/jd/gui/images/jd_icon_16.png"), getImage("/org/jd/gui/images/jd_icon_32.png"), getImage("/org/jd/gui/images/jd_icon_64.png"), getImage("/org/jd/gui/images/jd_icon_128.png")));
             mainFrame.setMinimumSize(new Dimension(Constants.MINIMAL_WIDTH, Constants.MINIMAL_HEIGHT));
             mainFrame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);