Fold URIs with CRLF

This is in accordance with RFC2483, which dictates that all lines need
to be split by CRLF.

This however still needs to wait for upstream Qt changes [1], so that
the broken multi-drag mode works again.

[0] https://www.ietf.org/rfc/rfc2483.txt
[1] https://codereview.qt-project.org/c/qt/qtdeclarative/+/579204

src/Models/path_model.cpp

@@ -66,7 +66,7 @@ void PathModel::multiselect(int i) {
 void PathModel::refresh_folded_paths() {
 	// only add multiselected items in multiselect mode
 	auto v = paths | std::views::filter([&](const auto &i) { return !multiselected || i.multiselect; });
-	folded_uri_list = std::accumulate(v.cbegin(), v.cend(), QString(), [](QString s, const auto p) { return s.append(QString::fromStdString(p.get_uri()) + "\n"); });
+	folded_uri_list = std::accumulate(v.cbegin(), v.cend(), QString(), [](QString s, const auto p) { return s.append(QString::fromStdString(p.get_uri()) + "\r\n"); });
 	emit foldedUriListChanged(folded_uri_list);
 }