Add JSON game database to replace dat parsing

src/frontend-common/game_database.h

@@ -0,0 +1,45 @@
+#pragma once
+#include "core/types.h"
+#include <memory>
+#include <optional>
+#include <string>
+#include <string_view>
+#include <unordered_map>
+#include <vector>
+
+class CDImage;
+
+struct GameDatabaseEntry
+{
+  std::string serial;
+  std::string title;
+  std::string genre;
+  std::string developer;
+  std::string publisher;
+  u64 release_date;
+  u32 min_players;
+  u32 max_players;
+  u32 min_blocks;
+  u32 max_blocks;
+  u32 supported_controllers_mask;
+};
+
+class GameDatabase
+{
+public:
+  GameDatabase();
+  ~GameDatabase();
+
+  bool Load();
+  void Unload();
+
+  bool GetEntryForDisc(CDImage* image, GameDatabaseEntry* entry);
+
+  bool GetEntryForCode(const std::string_view& code, GameDatabaseEntry* entry);
+
+  bool GetTitleAndSerialForDisc(CDImage* image, GameDatabaseEntry* entry);
+  //bool Get
+
+private:
+  void* m_json = nullptr;
+};