Fix Qt 6 definition of macro ‘Q_DECLARE_MOVABLE_CONTAINER’

adding #include <QHash>

+ code fail to compile if it uses deprecated APIs.
=> see .pro file

sources/qetinformation.cpp

@@ -1,25 +1,26 @@
 /*
 	Copyright 2006-2020 The QElectroTech Team
 	This file is part of QElectroTech.
-	
+
 	QElectroTech 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.
-	
+
 	QElectroTech 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.
-	
+
 	You should have received a copy of the GNU General Public License
 	along with QElectroTech.  If not, see <http://www.gnu.org/licenses/>.
 */
-#include "qetinformation.h"
 
 #include <QObject>
 #include <QHash>
 
+#include "qetinformation.h"
+
 /**
 	@brief QETInformation::titleblockInfoKeys
 	@return all available key for use with a titleblock
@@ -47,7 +48,7 @@ QStringList QETInformation::titleblockInfoKeys()
 	info_list << "savedtime";
 	info_list << "savedfilename";
 	info_list << "savedfilepath";
-	
+
 	return info_list;
 }