Hotfix 720: 720 degrees of separation

It's a funny coincidence that revision 720 is also the revision where I got in some better names for doing tricks. So do a "720 leg grab double backflip" to celebrate! There are some changes in how score is calculated that go along with that.

But the main reason I'm putting this up is to fix some of the glaring bugs that @PurkisM reported - I fixed the borked wallrun challenge on Future Island, and made it so you couldn't skate along the ground and walls in your swan pose.

I also changed the in-game leaderboards to show your position instead of the top. Because that's what you care about the most, yeah?