Allow custom plugin to define their own list of settings panels

src/api/QGCSettings.cc

+/****************************************************************************
+ *
+ *   (c) 2009-2016 QGROUNDCONTROL PROJECT <http://www.qgroundcontrol.org>
+ *
+ * QGroundControl is licensed according to the terms in the file
+ * COPYING.md in the root of the source code directory.
+ *
+ ****************************************************************************/
+
+#include "QGCSettings.h"
+
+/// @file
+///     @brief Core Plugin Interface for QGroundControl. Settings element.
+///     @author Gus Grubba <mavlink@grubba.com>
+
+QGCSettings::QGCSettings(QString title, QUrl url, QUrl icon)
+    : _title(title)
+    , _url(url)
+    , _icon(icon)
+{
+}

src/api/QGCSettings.h

+/****************************************************************************
+ *
+ *   (c) 2009-2016 QGROUNDCONTROL PROJECT <http://www.qgroundcontrol.org>
+ *
+ * QGroundControl is licensed according to the terms in the file
+ * COPYING.md in the root of the source code directory.
+ *
+ ****************************************************************************/
+
+#pragma once
+
+#include <QObject>
+#include <QUrl>
+
+/// @file
+///     @brief Core Plugin Interface for QGroundControl. Settings element.
+///     @author Gus Grubba <mavlink@grubba.com>
+
+class QGCSettings : public QObject
+{
+    Q_OBJECT
+public:
+    QGCSettings(QString title, QUrl url, QUrl icon = QUrl());
+
+    Q_PROPERTY(QString  title       READ title      CONSTANT)
+    Q_PROPERTY(QUrl     url         READ url        CONSTANT)
+    Q_PROPERTY(QUrl     icon        READ icon       CONSTANT)
+
+    virtual QString     title       () { return _title; }
+    virtual QUrl        url         () { return _url;   }
+    virtual QUrl        icon        () { return _icon;  }
+
+protected:
+    QString _title;
+    QUrl    _url;
+    QUrl    _icon;
+};