fix: Improve FindNearbyPlayersSystem performance

[askneller]

Addresses #19. Refactoring of the FindNearbyPlayersSystem

Also adds AttackInProximityComponent that was in some of the hostile critter prefabs. And also adjusts CheckAttackStopAction to consider AttackInProximityComponent.

I noted a good performance improvement on my system.

Here is the before debug output:

And the after:

How to Test

I did the above tests using the Core Gameplay module with WildAnimals enabled. To make testing easier I changed the reference to the deer prefab in WildAnimalsSpawnSystem (line 80) to WildAnimals:HostileDeer so that it spawns lots of entities that will look for players.

If you want to recreate on your system the seed for the above image is 0pSFAX7zlh7pIlNnLj0DxOfJnzoUsoYc

[askneller]

Thanks for the review @skaldarnar, I've implemented those changes.