Implemented dependency solving for db schemas creation. Added macro for

begin/end iterator.

core/imetadataplugin.h

@@ -19,6 +19,8 @@ public:
     virtual QString pluginDescription();
     virtual int schemaVersion();
     virtual QStringList schemas();
+    virtual QStringList dependsOn();
+
     virtual void init(const QJsonObject &metaData);
 
 protected:
@@ -31,6 +33,7 @@ private:
     QString m_description;
     int m_schemaVersion;
     QStringList m_schemas;
+    QStringList m_dependsOn;
 
     QString parseLocaleText(const QJsonObject &object);
 };