Added multiple armor sets and Changed the faction_required to faction_restriction (Read Description For More Information)

- Added Imperial Snow Trooper Armor Set
- Added Imperial Snow Trooper Backpack
- Added Rebel Snow Armor Set
- Added Rebel Snow Backpack
- Added Basic Death Trooper Armor Set
- Added Battle Worn Rebel Recon Armor
- Changed faction_required to its correct string (faction_restriction)