PreferencesDialog: initial draft

Here's an initial draft for the new preferences dialog. The basics of
the GUI are done, however there's absolutely no functionality yet.

include/MainWindow.h

@@ -125,6 +125,7 @@ public slots:
 	bool saveProject();
 	bool saveProjectAs();
 	void showSettingsDialog();
+	void showPreferencesDialog();
 	void aboutLMMS();
 	void help();
 	void toggleAutomationEditorWin();

include/PreferencesDialog.h

@@ -0,0 +1,43 @@
+/*
+ * PreferencesDialog.h - declaration of class PreferencesDialog
+ *
+ * Copyright (c) 2009 Tobias Doerffel <tobydox/at/users.sourceforge.net>
+ *
+ * This file is part of Linux MultiMedia Studio - http://lmms.sourceforge.net
+ *
+ * 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 2 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 (see COPYING); if not, write to the
+ * Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ * Boston, MA 02110-1301 USA.
+ *
+ */
+
+#ifndef _PREFERENCES_DIALOG_H
+#define _PREFERENCES_DIALOG_H
+
+#include <QtGui/QDialog>
+
+namespace Ui { class PreferencesDialog; }
+
+class PreferencesDialog : public QDialog
+{
+public:
+	PreferencesDialog();
+
+private:
+	Ui::PreferencesDialog * ui;
+
+} ;
+
+#endif
+