qt5 conv: replace reset() for models

In qt5 reset() is no longer available for models, instead one should
call beginResetModel(), then reset the model data and then call
endResetModel().

See https://doc.qt.io/qt-5/qabstractitemmodel-obsolete.html#reset

catalogmodel.cpp

@@ -45,9 +45,9 @@ void CCatalogModel::onLanguageChanged()
 
 void CCatalogModel::setModelData (CCatalog *pCatalog)
 {
-	reset();
+	beginResetModel();
 	m_pCatalog = pCatalog;
-	reset();
+	endResetModel();
 }
 
 int CCatalogModel::columnCount (const QModelIndex& parent) const

chaptermodel.cpp

@@ -45,16 +45,18 @@ void CChapterModel::onLanguageChanged()
 
 void CChapterModel::clear()
 {
+	beginResetModel();
 	m_listChapter.clear();
 	m_pCatalog = 0;
-	reset();
+	endResetModel();
 }
 
 void CChapterModel::setModelData (CCatalog *pCatalog, QList<CChapter*> listChapter)
 {
+	beginResetModel();
 	m_listChapter = listChapter;
 	m_pCatalog = pCatalog;
-	reset();
+	endResetModel();
 }
 
 int CChapterModel::columnCount (const QModelIndex & parent) const

questionmodel.cpp

@@ -40,14 +40,16 @@ void CQuestionModel::onLanguageChanged()
 
 void CQuestionModel::clear()
 {
+	beginResetModel();
 	m_pChapter=0;
-	reset();
+	endResetModel();
 }
 
 void CQuestionModel::setModelData (CChapter *pChapter)
 {
+	beginResetModel();
 	m_pChapter = pChapter;
-	reset();
+	endResetModel();
 }
 
 int CQuestionModel::columnCount (const QModelIndex & parent) const