tweaked shotgun materials

shotgun slug and flechette buff at close range; sprint tweaks; flechette tracer size increased

shotgun slug tweak, animation speed and transition tweaks

added shotgun

spacecat survivability and UI tweak; adjustments to how bots select weapons and what ranges they'll use pistols at

Tweaks to weapon swaps for quality of life reasons

attempted to fix a bug where you can't use the m41's grenade launcher if you get knocked down while reloading; if you reselect it, it should work now

fixed m4a4 akimbo reload

finished the rest of the m4a4

minor audio tweak