Cael's Sprite request thread (updated regularly)

[Cael_Aislinn]

- Moved planet turf sprites priority low -> medium
- Marked radio backpack as completed
- Moved civilian human jumpsuits priority medium -> low
- Moved fighter components priority high -> low
- Moved fighter fuel tank and ammoloader high -> medium
- Added UNSC fortification sprites (high)
- Added desert terrain doodads