Add initial game list class implementation

src/core/game_list.h

@@ -0,0 +1,36 @@
+#pragma once
+#include "types.h"
+#include <optional>
+#include <string>
+#include <string_view>
+#include <unordered_map>
+
+class CDImage;
+
+class GameList
+{
+public:
+  GameList();
+  ~GameList();
+
+  static std::string GetGameCodeForImage(CDImage* cdi);
+  static std::string GetGameCodeForPath(const char* image_path);
+  static std::optional<ConsoleRegion> GetRegionForCode(std::string_view code);
+
+  void AddDirectory(const char* path, bool recursive);
+
+private:
+  struct GameListEntry
+  {
+    std::string path;
+    std::string code;
+    std::string title;
+    ConsoleRegion region;
+  };
+
+  bool GetGameListEntry(const char* path, GameListEntry* entry);
+
+  void ScanDirectory(const char* path, bool recursive);
+
+  std::vector<GameListEntry> m_entries;
+};