Better settings for Gateways to Eternity.
- Rebalance gateways to work alongside Champions.
- Increase gateway timeout per wave from 50 seconds to 5 minutes.
- Remove wave modifiers for attributes like increased health/armor.
- Make gateways keep mobs on failure.
- Move gateway UI to above the gateway to not block the Champions UI.
- Rework basic gateways
- Rework Slime/Enderman/Blaze gateways to have unique spawning mechanics.
- Add Spider/Skeleton gateways.
- Simplify recipes to 1 Ender Eye + 8 mob drops.
- Rework endless gateways
- Remove default endless gateways.
- Add endless Creeper/Zombie gateways.
