ClusterImprovements

• Allows clusters that replace tier 3 enemies to appear beyond level 3.
• TODO: Might also potentially fix duplicate enemies being super common due to a bug in the enemy spawning code.

-Jimothy, Employee of the year

Credits

• Me, Myself, and I.
• Sinik for pointing me to this weird problem.
• Also JOATS for helping me understand this weird problem.
• Rodrigo's beautiful mod icon.