Working on save-load system and UI

src/quest/QuestJournal.h

@@ -1,6 +1,8 @@
 #pragma once
 
 #include "quest/QuestTypes.h"
+#include "ISaveable.h"
+#include "external/nlohmann/json.hpp"
 #include <string>
 #include <unordered_map>
 #include <vector>
@@ -8,10 +10,13 @@
 
 namespace ZL::Quest {
 
-class QuestJournal {
+class QuestJournal : public ZL::ISaveable {
 public:
 	bool loadFromFile(const std::string& path, const std::string& zipFile = "");
 
+	void save(nlohmann::json& out) const override;
+	void load(const nlohmann::json& in) override;
+
 	// Event callbacks — set by the owner (MenuManager) to receive notifications.
 	std::function<void(const std::string& questId)> onQuestUnlocked;
 	std::function<void(const std::string& questId)> onQuestCompleted;