Harder mob tracking for Hardmode

Mobs can see through walls on Hardmode unless you are sneaking, if mobs cannot reach you in your hideout they will continue to search a way to get to you until a next best target appears (Another player.)

Something i think should also exist in normal is the feature that when you shoot a mob from afar, it will walk towards the direction of that projectile. The length for which they search is affected by the difficulty.

Easy: 0 seconds/Normal: 10 seconds/Hard: 30 seconds.

This could go well with the new larger caves where mobs struggle to detect you from afar and making them easy targets.