Collection: Make sure RunQuery does not access collection items

- Rename `QueryOptions` to `CollectionFilterOptions`.
- Create new class `CollectionQueryOptions` for passing options from model to `CollectionQuery`.
- Rename `Directory` to `CollectionDirectory`.

Fixes #1095

src/collection/collectionfilteroptions.cpp

@@ -0,0 +1,42 @@
+/*
+ * Strawberry Music Player
+ * Copyright 2023, Jonas Kvinge <jonas@jkvinge.net>
+ *
+ * Strawberry 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 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Strawberry 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 Strawberry.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#include <QtGlobal>
+#include <QDateTime>
+
+#include "core/song.h"
+
+#include "collectionfilteroptions.h"
+
+CollectionFilterOptions::CollectionFilterOptions() : filter_mode_(FilterMode_All), max_age_(-1) {}
+
+bool CollectionFilterOptions::Matches(const Song &song) const {
+
+  if (max_age_ != -1) {
+    const qint64 cutoff = QDateTime::currentDateTime().toSecsSinceEpoch() - max_age_;
+    if (song.ctime() <= cutoff) return false;
+  }
+
+  if (!filter_text_.isNull()) {
+    return song.artist().contains(filter_text_, Qt::CaseInsensitive) || song.album().contains(filter_text_, Qt::CaseInsensitive) || song.title().contains(filter_text_, Qt::CaseInsensitive);
+  }
+
+  return true;
+
+}