Created separate directory for player engine

[someplayer] / src / someplayer.h

#ifndef SOMEPLAYER
#define SOMEPLAYER

// common settings, constants and so on

namespace SomePlayer {
        namespace DataObjects {
                class Track;
                class TrackMetadata;
                class TagResolver;
                class Playlist;
        };
        namespace Storage {
        };
        namespace Playback {
        };
};

// common includes

#include <QString>
#include <QStringList>
#include <QList>
#include <QMap>
#include <QUrl>

#define _DYNAMIC_PLAYLIST_MAX_COUNT_ 50

#endif