Balancing changes

• Reduced health of pink boss from 50 to 35
• Replaced tier 1 enemy wave Thie - Thie with Drone - Thie
• Drops despawn a bit earlier
• Rapid-MG attack pattern will now regenerate ammo when the third bullet despawns instead of when the first despawns

New features

• Attack patterns can now be dropped manually from slots by pressing X on the keyboard or x on the controller. This reduces the score by 5