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

emulator/main.cpp

@@ -107,6 +107,17 @@ int main() {
                     needs_redraw = true;
                 }
             }
+        } else if (launcher.is_game_selected()) {
+            // No user input, but check if game wants frame tick updates
+            current_game = launcher.get_selected_game();
+            if (current_game->wants_frame_updates()) {
+                InputEvent frame_event = {INPUT_FRAME_TICK, 0, 0, 0, 0, 0, true};
+                needs_redraw = current_game->update(frame_event) || needs_redraw;
+                if (current_game->wants_to_exit()) {
+                    launcher.reset();
+                    needs_redraw = true;
+                }
+            }
         }
 
         // Always redraw every frame for emulator