Allow using Spindash for trick input

This branch introduces an alternate method of Tricking without needing to release and tap the Accelerate button.

While the Spindash button already worked as a Trick input, you would immediately fastfall barring a frame perfect press. In this branch, you can still fastfall out of a Trick with the Spindash button but you'll have to press the button a second time.

trix

I'm not sure if I need to mess with the DEMOVERSION for this so please advise if this is wanted.