Add Lua scripting support to desktop emulator

- Created emulator-specific lua_game_emulator.cpp using filesystem instead of FatFS
- Created lua_game_loader_emulator.cpp to scan games/lua_examples directory
- Updated CMakeLists.txt to include Lua 5.4 engine and bindings
- Updated to SFML 3.0 API compatibility (event handling, sprite initialization)
- Updated Game class to use public members for Lua bindings
- Updated GameLauncher to use std::function for lambda captures
- Added continuous 60 FPS rendering for smooth display
- Emulator now loads and runs all three example Lua games

emulator/game_launcher.h

@@ -1,25 +1,33 @@
 // Copy of game_launcher.h for emulator build
 #include <stdint.h>
 #include <vector>
+#include <functional>
 #include "input_event.h"
 #include "game.h"
+
 class LowLevelRenderer;
 class LowLevelGUI;
 class InputManager;
+
 struct GameEntry {
     const char* name;
     const char* description;
-    Game* (*factory)(uint16_t width, uint16_t height, LowLevelRenderer* renderer, LowLevelGUI* gui, InputManager* input_manager);
+    std::function<Game*(uint16_t, uint16_t, LowLevelRenderer*, LowLevelGUI*, InputManager*)> factory;
 };
+
 class GameLauncher {
 public:
     GameLauncher(uint16_t width, uint16_t height, LowLevelRenderer* renderer, LowLevelGUI* gui, InputManager* input_manager);
-    void register_game(const char* name, const char* description, Game* (*factory)(uint16_t, uint16_t, LowLevelRenderer*, LowLevelGUI*, InputManager*));
+    
+    void register_game(const char* name, const char* description, 
+                      std::function<Game*(uint16_t, uint16_t, LowLevelRenderer*, LowLevelGUI*, InputManager*)> factory);
+    
     void draw();
     bool update(const InputEvent& event);
     Game* get_selected_game();
     void reset();
     bool is_game_selected() const { return selected_game != nullptr; }
+
 private:
     uint16_t width;
     uint16_t height;
@@ -29,6 +37,7 @@ private:
     std::vector<GameEntry> games;
     int selected_index;
     Game* selected_game;
+    
     static const int MENU_Y_START = 60;
     static const int MENU_ITEM_HEIGHT = 40;
     static const int MENU_PADDING = 10;