Demo 0.0.4 - Loops and ramps!

New small update: loops and ramps!

Although this update is small in terms of amount of additions, the loop and the ramps actually change the gameplay completely, with lots of different possibilities!

1. Added loop and ramps to the Freestyle Arena
2. Added ramps to the Figure 8 Track
3. New arena: Flat Arena (right now it doens't seem like much, but it will be useful in modes like tag and demolition)