Cryomancer update

new class: cryomancer

necromancer
-greatly reduced vertical aiming for necroplasm charge

exterminator
-increased gun arm bullet damage to 10
-reduced gun arm grenade damage to 20
-reduced gun arm charged shot grenade damage to 45
-reduced incendiary grenade burst explosion damage to 25

bighead
-removed launch spore self damage
-removed iframes from grabs

quality of life/bug fixes
-removed powerups
-fixed cylinder hitboxes
-back end optimization to hopefully help with loading times and performance (may or may not do anything)