Big update

1- It's now possible to change bikes. The player can choose between 2-stroke and 4-stroke models. Initially, you will only have one standard model available. The player will need to win events to earn money and buy the other models, which are currently locked. 2- We created an animation system where it will be possible to activate or deactivate the flip levers. 3- We fixed bugs that hindered gameplay. 4- We improved the fall system; the ragdoll is now much better. 5- Initially, the tracks will be locked. We will be working on an unlocking system for future updates. 6- It is now possible to perform a stopie when at a certain speed. 7- We updated and improved some animations.