[MISSION] Powerplant - Power Struggle

[eyes6526]

Wave 1:
- Fixed Giant Shotguns

Wave 2:
- Changed Direct Hit and Heavy TotalCounts to 5 so they hopefully spawn together more often

Wave 5:
- Slightly decreased second subwave common counts so they shouldn't straggle as much
- Slightly increased Colonel Barrage waitbetweenspawns so they're a bit more forgiving

Wave 6:
- Very slightly decreased Tank HP