Mission 3 Fix

Mission 3:
-Tug should now pickup and carry cargo in mission start.

Mission 7:
- Pilots now have plasma rifle.
- Nuke makes explosion sounds and screen goes white on the blast.

Bonus missions descriptions added.
Gulag mission added on the end, and crash hopefully fixed.

Better color blend skyboxes.

Update:
-Added the two original missions that were "cut" but are still present in the mod. These were fighting the Black Dogs on Ganymede.

Small update:
-Upscaled planet load screens
-Fixed mission 3 ending text from being cut off