More progress on my accelerator coaster

I now have all the anti-rollback brake fins animated properly, although it's just cosmetic and they don't function yet. I have also reduced the length of the launch end piece to two tiles, mostly because it simplifies the implementation a bit and there was no real reason for it be three. The next thing I want to do is make it so the launch doesn't start from the station - this ride had to be hacked with an invisible station and the hack causes a number of problems so I want to get it functioning properly but I think it's going to be difficult.