Thanks to @t00thpick1 for his work on this update

• Fixed an IndexOutOfBoundsException error when trying to access UserBlockTracker from an invalid range (thanks t00thpick1)
• (API) UserBlockTracker is now the interface by which our block-tracker will be known (thanks t00thpick1)
• Optimized memory access for Acrobatics fall anti-exploit mechanics (thanks t00thpick1)

I'll be mostly focusing on T&C after this patch, there are some existing minor barely worth fixing bugs that I'm aware of but I don't know if I'll put out 2.1.169 anytime soon, it will come eventually though. My main intent is to focus on T&C.