New JSON config format

include/core/orderedset.h

@@ -0,0 +1,30 @@
+#pragma once
+#ifndef ORDERED_SET_H
+#define ORDERED_SET_H
+
+#include <QJsonArray>
+
+template <typename T>
+class OrderedSet : public std::set<T>
+{
+    using std::set<T>::set;
+
+public:
+    // Not introduced to std::set until C++20
+#if __cplusplus < 202002L
+    bool contains(const T& value) const {
+        return this->find(value) != this->end();
+    }
+#endif
+    QSet<T> toQSet() const {
+        return QSet<T>(this->begin(), this->end());
+    }
+    static QSet<T> fromQSet(const QSet<T>& set) {
+        return OrderedSet<T>(set.begin(), set.end());
+    }
+    bool isEmpty() const {
+        return this->empty();
+    }
+};
+
+#endif // ORDERED_SET_H