Remove mostly pointless metatypes.h

src/core/metatypes.h

-/*
-    This file is part of kdepimlibs.
-
-    SPDX-FileCopyrightText: 2010 Will Stephenson <wstephenson@kde.org>
-
-    SPDX-License-Identifier: LGPL-2.0-or-later
-*/
-
-#ifndef METATYPES_H
-#define METATYPES_H
-
-#include <QModelIndex>
-#include <QMetaType>
-
-Q_DECLARE_METATYPE(QModelIndex)
-
-#endif // METATYPES_H

src/widgets/agentactionmanager.cpp

@@ -11,8 +11,6 @@
 #include "agentinstancemodel.h"
 #include "agentmanager.h"
 #include "agenttypedialog.h"
-#include "metatypes.h"
-
 
 #include <QAction>
 #include <QIcon>

src/widgets/recentcollectionaction.cpp

@@ -5,7 +5,6 @@
  */
 
 #include "recentcollectionaction_p.h"
-#include "metatypes.h"
 #include "entitytreemodel.h"
 #include <KConfig>
 #include <KConfigGroup>

src/widgets/standardactionmanager.cpp

@@ -19,7 +19,6 @@
 #include "entitytreemodel.h"
 #include "favoritecollectionsmodel.h"
 #include "itemdeletejob.h"
-#include "metatypes.h"
 #include "pastehelper_p.h"
 #include "specialcollectionattribute.h"
 #include "collectionpropertiesdialog.h"