New bullet types, projectile rewrite

* Refactors projectile Bump()
* Converts projectile_type var strings to paths
* Reorganizes bullet projectile paths
* Made a pass through all the bullet_act() definitions. Mainly ensured that damage_type is checked when dealing damage to certain objects. Removed stupid /turf bullet_act() override, replaced with on_hit() overrides on the relevant projectiles.

* Adds shotgun pellets projectile. Adds Raptor's shotgun slug sprite.
* Gives stunshots more of their own identity, refluffs them as taser cartridges for shotguns. They still aren't obtainable anywhere unless spawned.
* Makes projectiles pass through girders and cultgirders with a certain probability, unless the girder itself was clicked.
* Projectiles are also able to pass through grilles. Low damage projectiles have a chance to be blocked by grilles. High damage projectiles have a chance to have some damage absorbed by the grille.
* Makes projectiles for blanks invisible.
* Adds flash bullet types
* Adds support for 'penetrating' projectiles
* Swaps .45 and 9mm projectile types. .45s hit slightly harder, 9mils have more ammo capacity.

code/game/objects/effects/effect_system.dm

@@ -233,6 +233,21 @@ steam.start() -- spawns the effect
 		return 0
 	return 1
 
+/////////////////////////////////////////////
+// Illumination
+/////////////////////////////////////////////
+
+/obj/effect/effect/smoke/illumination
+	name = "illumination"
+	opacity = 0
+	icon = 'icons/effects/effects.dmi'
+	icon_state = "sparks"
+
+/obj/effect/effect/smoke/illumination/New(var/newloc, var/brightness=15, var/lifetime=10)
+	time_to_live=lifetime
+	..()
+	SetLuminosity(brightness)
+
 /////////////////////////////////////////////
 // Bad smoke
 /////////////////////////////////////////////