Updates pull request from Roman Tsypuk to convert the build system from

ant to gradle.  Removes linux and windows application launch scripts and
produces an executable jar with all resources included.

src/main/java/io/github/dsheirer/audio/AudioChannelsPanel.java

@@ -0,0 +1,69 @@
+/*******************************************************************************
+ * sdrtrunk
+ * Copyright (C) 2014-2017 Dennis Sheirer
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>
+ *
+ ******************************************************************************/
+package io.github.dsheirer.audio;
+
+import io.github.dsheirer.audio.output.AudioOutput;
+import io.github.dsheirer.icon.IconManager;
+import io.github.dsheirer.settings.SettingsManager;
+import net.miginfocom.swing.MigLayout;
+
+import javax.swing.*;
+import java.awt.*;
+import java.util.List;
+
+public class AudioChannelsPanel extends JPanel
+{
+    private static final long serialVersionUID = 1L;
+
+    public AudioChannelsPanel(IconManager iconManager, SettingsManager settingsManager, IAudioController controller)
+    {
+        setLayout(new MigLayout("insets 0 0 0 0", "[][sg abc,grow,fill][][sg abc,grow,fill]", "[grow,fill]"));
+
+        setBackground(Color.BLACK);
+
+        List<AudioOutput> outputs = controller.getAudioOutputs();
+
+        addSeparator();
+
+        for(int x = 0; x < outputs.size(); x++)
+        {
+            add(new AudioChannelPanel(iconManager, settingsManager, outputs.get(x)));
+
+            if(x < outputs.size() - 1)
+            {
+                addSeparator();
+            }
+        }
+
+		/* Add an empty channel panel so that the panel is sized appropriately
+         * for either a single channel or two channels */
+        if(outputs.size() == 1)
+        {
+            addSeparator();
+            add(new AudioChannelPanel(iconManager, settingsManager, null), "growx");
+        }
+    }
+
+    private void addSeparator()
+    {
+        JSeparator separator = new JSeparator(JSeparator.VERTICAL);
+        separator.setBackground(Color.DARK_GRAY);
+        add(separator);
+    }
+}