Happy Ghast Accessibility

A mod for people with motion sickness having trouble with Happy Ghasts moving when turning the head.
This is solved by removing this response and instead controlling the movements with two new rotation
keys. It might look a bit jittery on multiplayer, but it shouldn't be severe. The mod is client-side
only, meaning you can play it on any server you want, though some anticheat might miscategorize this
because you are placing blocks in places you aren't looking at.