Added IService QObject derived class for emiting Qt signals from service objects.

core/iservice.h

@@ -0,0 +1,25 @@
+#ifndef ISERVICE_H
+#define ISERVICE_H
+
+#include <QObject>
+#include <QString>
+
+#include "core_global.h"
+
+class CORESHARED_EXPORT IService : public QObject
+{
+    Q_OBJECT
+
+public:
+    explicit IService(QObject *parent = 0);
+    virtual ~IService();
+
+signals:
+    void dbError(QString errMsg);
+    void dataChanged();
+    void permissionDenied();
+
+public slots:
+};
+
+#endif // ISERVICE_H