Fixed crossbow shooting steel bolts
Fixed projectiles exploding on impact preventing collection
Fixed arrows projectiles not applying bonus damage
Dawnguard perk replaced with silver perk on DLC1ArmorDawnguardShield and DLC1DawnguardRuneShield, both shields now apply bonus silver damage on bashes
Dawnguard members given silver damage and silver bolts when applicable.
Added background perks to apply silver damage consistently
Added background quest to apply perk to player character
Added textures for silver bolts and arrows