Yellow slimes won't try to shock non-mob food targets

[Ilysen]

purpose

yellow slimes distant from food or dirt on the ground won't try to actually go and eat it - instead they'll get trapped in a loop of shocking it with their ranged attack over and over

details

implements an override on the xenobio/yellow type to cause ICheckRangedAttack to return false if the target isn't a mob, and to run the base method if it is. this could also feasibly be put on the base slime type, if desired

testing

put an adult yellow slime in a pen with a blood splatter both before and after applying the changes. before, they get stuck shocking it; after, they do not, and will go over to normal adjacent distance and eat it.