Fixed countdown and improved menus.

Removed crashes related to countdown to start.
Increased deadzone in menus added d-pad navigation.
Updated to latest version of Gamemaker (v1.3.1380).
Trialling bigger boost pickups

Twice original size
Added mud, ice and speed gel.

Mud slows players that are in it.
Ice reduces acceleration/friction/handling.
Speed gel increases max speed and acceleration.