Randomize tracks in the r300 bracket

[Torvald]

Just an idea to spice up the r300 bracket so it's not the same race every time.

Make the r300 track version switch randomly each race between lower rating versions of the track. Like some times it would be the regular r300 version, sometimes r120 version, sometimes r240 version, etc.

[AmalahRose]

I like this idea, training up a new bird is fun because of the track diversity, things get a bit samey once you reach the top.

[PotatoTree]

I like this idea too. If they don't randomize it, at least add some more random obstacles. I think the r240 race has move obstacles than the r300 one, which was kinda lame.

And they need to add a Coerthas map!