Fixed JesusA not working

Implemented Setbacks for movement checks.

Configurable per check, simply add

setback: true

to the movement checks that you want to have setbacks enabled for

Fixed errors on 1.8.8

Added support for versions 1.8.8 - 1.21

Added ElytraB check

Fixed an edge case false positive with NoSlowD

Fixed a false positive with ReachB

Added a configurable update checker.

Added ElytraFlyA
Fixed NullPointerException