Add frame tick system for continuous animation

- Added INPUT_FRAME_TICK event type to input_event.h
- Added wants_frame_updates() virtual method to Game base class
- Implemented frame tick logic in main loop (basic1.cpp and emulator/main.cpp)
- Added Lua bindings: game.set_frame_updates(bool) and INPUT.FRAME_TICK
- Updated LuaGame to support frame updates via registry flag
- Updated ball.lua to use continuous frame updates for smooth animation
- Both hardware and emulator now support continuous animation for physics/games

lib/game.h

@@ -94,6 +94,17 @@ public:
      */
     virtual bool wants_to_exit() const { return false; }
 
+    /**
+     * @brief Check if game wants continuous frame updates
+     * 
+     * Games that need animation or continuous updates (like physics simulations)
+     * can override this to return true. They will receive INPUT_FRAME_TICK events
+     * every frame, even without user input.
+     * 
+     * @return true if game needs frame updates, false for event-driven only
+     */
+    virtual bool wants_frame_updates() const { return false; }
+
     /**
      * @brief Get the type of game for safe downcasting without RTTI
      */