DTG: Add tray icons for Windows and Mac

White icon copied from Android drawable-mdpi/ic_stat_router_active.png for Windows
Converted to black in Gimp for Mac

apps/desktopgui/build.xml

@@ -75,6 +75,8 @@
 		<property name="workspace.changes.tr" value="" />
                 <!-- ideal for linux: 24x24, but transparency doesn't work -->
                 <copy tofile="${build}/desktopgui/resources/images/logo.png" file="../../installer/resources/themes/console/images/itoopie_xsm.png" />
+                <copy todir="${build}/desktopgui/resources/images" file="images/itoopie_black_24.png" />
+                <copy todir="${build}/desktopgui/resources/images" file="images/itoopie_white_24.png" />
 		<jar basedir="${build}" excludes="messages-src/**" destfile="${dist}/${jar}">
 			<manifest>
 				<attribute name="Main-Class" value="net.i2p.desktopgui.Main"/>

apps/desktopgui/src/net/i2p/desktopgui/TrayManager.java

@@ -38,6 +38,11 @@ abstract class TrayManager {
     ///Our tray icon, or null if unsupported
     protected TrayIcon trayIcon;
 
+    private static final String PNG_DIR = "/desktopgui/resources/images/";
+    private static final String MAC_ICON = "itoopie_black_24.png";
+    private static final String WIN_ICON = "itoopie_white_24.png";
+    private static final String LIN_ICON = "logo.png";
+
     /**
      * Instantiate tray manager.
      */
@@ -185,9 +190,16 @@ abstract class TrayManager {
      * @throws AWTException if image not found
      */
     private Image getTrayImage() throws AWTException {
-        URL url = getClass().getResource("/desktopgui/resources/images/logo.png");
+        String img;
+        if (SystemVersion.isWindows())
+            img = WIN_ICON;
+        else if (SystemVersion.isMac())
+            img = MAC_ICON;
+        else
+            img = LIN_ICON;
+        URL url = getClass().getResource(PNG_DIR + img);
         if (url == null)
-            throw new AWTException("cannot load tray image");
+            throw new AWTException("cannot load tray image " + img);
         Image image = Toolkit.getDefaultToolkit().getImage(url);
         return image;
     }