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

games/lua_bindings.cpp

@@ -186,6 +186,21 @@ static int lua_game_exit(lua_State* L) {
     return 0;
 }
 
+// game.set_frame_updates(enabled) - enable/disable continuous frame tick events
+static int lua_game_set_frame_updates(lua_State* L) {
+    LuaGame* game = get_game(L);
+    if (!game) return 0;
+    
+    bool enabled = lua_toboolean(L, 1);
+    
+    // Set frame updates flag (will be checked in wants_frame_updates())
+    lua_pushstring(L, "__wants_frame_updates");
+    lua_pushboolean(L, enabled);
+    lua_settable(L, LUA_REGISTRYINDEX);
+    
+    return 0;
+}
+
 // ============================================================================
 // INPUT TYPE CONSTANTS
 // ============================================================================
@@ -283,6 +298,10 @@ void lua_bindings_register(lua_State* L, LuaGame* game) {
     lua_pushcfunction(L, lua_game_exit);
     lua_settable(L, -3);
     
+    lua_pushstring(L, "set_frame_updates");
+    lua_pushcfunction(L, lua_game_set_frame_updates);
+    lua_settable(L, -3);
+    
     // Create empty vars table for persistent state
     lua_pushstring(L, "vars");
     lua_newtable(L);