Despawn Tweaks

Multiloader port of DespawnTweaker, a performance mod that fixes cases where mobs won't be removed.

Features:

• Allows mobs that pick up items or gear to despawn naturally.
• Drops held loot properly when mobs despawn.
• Allows mobs that spawn from spawners to bypass this rule, optionally only in specific structures.
• Improves performance on both dedicated servers and in singleplayer.