[Circuit] Lemon Circuit Zone for v2.2

So, I decided to port Lemon Circuit Zone to 2.2.
That's all.
I also made use of some new objects that 2.2 has, and made some other tiny changes.
It shows up in the "Circuit" section of the race gametype when selecting a level, have fun.

[MellowJacket]

Circuit still lives, here at least. Welcome to releases!

[PencilVoid]

Updated prefix to the new prefix rules.