Add prevention for snowball lag machines

[kickedtomato]

Initial Overview This is a lag machine type that is pretty common and I would love a fix for it similar to the armor stand lag method.

How it works Snow golems shoot snowballs at zombies, and these snowballs can be captured by water streams and then sent into a pooling chamber where they pool and create lag.

[dniym]

There is a protection for this in place already... See: https://github.com/dniym/IllegalStack/wiki/PreventProjectileExploit2

if you're still having issues please let us know.