Move GUI resources into a GUI package.

.gitignore

@@ -9,7 +9,7 @@
 *.war
 *.ear
 
-# virtual machine crash logs, see http://www.java.com/en/download/help/error_hotspot.xml
+# virtual machine crash logs, see http://www.java.com/en/download/gui.help/error_hotspot.xml
 hs_err_pid*
 
 # generic

src/main/java/com/imsweb/naaccrxml/gui/Standalone.java

@@ -181,7 +181,7 @@ private static String getVersion() {
     @SuppressWarnings("ConstantConditions")
     private JButton createToolbarButton(final String text, final String pageId, final String description) {
         JButton btn = new JButton();
-        btn.setIcon(new ImageIcon(Thread.currentThread().getContextClassLoader().getResource("icons/" + pageId + "_inactive.png")));
+        btn.setIcon(new ImageIcon(Thread.currentThread().getContextClassLoader().getResource("gui/icons/" + pageId + "_inactive.png")));
         btn.setOpaque(false);
         btn.setFocusPainted(false);
         btn.setFocusable(false);
@@ -199,11 +199,11 @@ public void actionPerformed(ActionEvent e) {
                 _layout.show(_centerPnl, pageId);
                 for (JButton btn : _buttons) {
                     if (btn.getActionCommand().equals(pageId)) {
-                        btn.setIcon(new ImageIcon(Thread.currentThread().getContextClassLoader().getResource("icons/" + btn.getActionCommand() + "_active.png")));
+                        btn.setIcon(new ImageIcon(Thread.currentThread().getContextClassLoader().getResource("gui/icons/" + btn.getActionCommand() + "_active.png")));
                         btn.setForeground(Color.BLACK);
                     }
                     else {
-                        btn.setIcon(new ImageIcon(Thread.currentThread().getContextClassLoader().getResource("icons/" + btn.getActionCommand() + "_inactive.png")));
+                        btn.setIcon(new ImageIcon(Thread.currentThread().getContextClassLoader().getResource("gui/icons/" + btn.getActionCommand() + "_inactive.png")));
                         btn.setForeground(Color.GRAY);
                     }
                 }
@@ -222,7 +222,7 @@ else if ("menu-help".equals(cmd)) {
             try {
                 File targetFile = File.createTempFile("naaccr-xml-help", ".html");
                 targetFile.deleteOnExit();
-                InputStream is = Thread.currentThread().getContextClassLoader().getResourceAsStream("help/help.html");
+                InputStream is = Thread.currentThread().getContextClassLoader().getResourceAsStream("gui/help/help.html");
                 OutputStream os = new FileOutputStream(targetFile);
                 IOUtils.copy(is, os);
                 is.close();

src/main/resources/icons/readme.txt → src/main/resources/gui/icons/readme.txt

@@ -1,4 +1,4 @@
-Free icons set: https://www.iconfinder.com/iconsets/ellegant
+Free gui.icons set: https://www.iconfinder.com/iconsets/ellegant
 
 Downloaded PNG transparent ones.