improve entity culling

[luminantdawn]

entity culling doesn't work that well and fps can still drop a lot due to hidden entities that should be culled but aren't. This mod fixes this but isnt compatible with any other mods and often crashes the game: "https://github.com/my-life-is-bad/EntityCulling-1.8.9-port/tree/v1.8.9-6.5.0". It would be nice of you to improve the entity culling by using the entity culling implementation from that mod.