OTHER: rename 'lib' directory to 'backend_xmmsclient++'

I plan to replace the boost based c++ bindings with native Qt based bindings
in the long run
The currently there is libxmms2qt, but tru stated working on bindings based
on genipc

lib/xcollection_p.h

@@ -1,53 +0,0 @@
-/**
- *  This file is a part of Promoe, an XMMS2 Client.
- *
- *  Copyright (C) 2005-2008 XMMS2 Team
- *
- *  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.
- */
-
-// these headers are placed in here, so that the moc files are created and
-// that these Objects can emit signals
-
-#ifndef __XCOLLECTION_P_H__
-#define __XCOLLECTION_P_H__
-
-#include <xmmsclient/xmmsclient++.h>
-
-#include "xcollection.h"
-
-#include <QObject>
-#include <QStringList>
-#include <QString>
-
-class XCollection::Private : public QObject {
-    Q_OBJECT
-
-	public:
-		Private (XCollection* collection, XClient* client);
-
-		bool on_collection_modified (const Xmms::Dict &value);
-		bool handle_playlists_list (const Xmms::List< std::string > &list);
-		bool handle_active_pls_changed (const std::string &name);
-		bool handle_idlist_created (const Xmms::Coll::Coll &idlist );
-
-		QStringList m_playlists;
-		QString m_activePlaylist;
-		XClient* m_client;
-
-	signals:
-    	void collectionModified (QString collection, QString ns, int type,
-    	                         QString newname);
-
-		void activePlaylistChanged (QString newActive, QString oldActive);
-};
-
-#endif