Replace deprecated qAsConst with std::as_const

qAsConst was deprecated in Qt 6.6; std::as_const (C++17, already the
project standard) is the drop-in replacement. Clears 46 -Wdeprecated-
declarations warnings across 18 files. No behavioural change.

sources/editor/ui/qetelementeditor.cpp

@@ -1093,7 +1093,7 @@ void QETElementEditor::updateAction()
 			<< ui->m_revert_selection_action
 			<< ui->m_paste_from_file_action
 			<< ui->m_paste_from_element_action;
-	for (auto action : qAsConst(ro_list)) {
+	for (auto action : std::as_const(ro_list)) {
 		action->setDisabled(m_read_only);
 	}
 
@@ -1108,7 +1108,7 @@ void QETElementEditor::updateAction()
 				<< ui->m_flip_action
 				<< ui->m_mirror_action;
 	auto items_selected = !m_read_only && m_elmt_scene->selectedItems().count();
-	for (auto action : qAsConst(select_list)) {
+	for (auto action : std::as_const(select_list)) {
 		action->setEnabled(items_selected);
 	}
 

sources/editor/ui/terminaleditor.cpp

@@ -428,7 +428,7 @@ void TerminalEditor::activeConnections(bool active)
 		m_editor_connections << connect(ui->m_label_frame_cb, &QCheckBox::toggled,
 										this, &TerminalEditor::labelFrameEdited);
 	} else {
-		for (auto const & con : qAsConst(m_editor_connections)) {
+		for (auto const & con : std::as_const(m_editor_connections)) {
 			QObject::disconnect(con);
 		}
 		m_editor_connections.clear();

sources/editor/ui/texteditor.cpp

@@ -84,7 +84,7 @@ void TextEditor::setUpChangeConnection(QPointer<PartText> part)
 
 void TextEditor::disconnectChangeConnection()
 {
-	for (const auto &connection : qAsConst(m_change_connection)) {
+	for (const auto &connection : std::as_const(m_change_connection)) {
 		disconnect(connection);
 	}
 	m_change_connection.clear();