[DNM][DNM][WIP] Projectile backend code port and update

Ports#54924,  #65061, #59804 from /tg.
adds auxiliary code from /tg to make code work.

code/game/objects/items/devices/forcefieldprojector.dm

@@ -84,6 +84,7 @@
 	layer = ABOVE_ALL_MOB_LAYER
 	anchored = TRUE
 	density = TRUE
+	pass_flags_self = PASSGLASS
 	mouse_opacity = MOUSE_OPACITY_OPAQUE
 	resistance_flags = INDESTRUCTIBLE
 	CanAtmosPass = ATMOS_PASS_DENSITY
@@ -101,11 +102,6 @@
 	generator = null
 	return ..()
 
-/obj/structure/projected_forcefield/CanPass(atom/movable/mover, turf/target)
-	if(istype(mover) && (mover.pass_flags & PASSGLASS))
-		return 1
-	return !density
-
 /obj/structure/projected_forcefield/play_attack_sound(damage_amount, damage_type = BRUTE, damage_flag = 0)
 	playsound(loc, 'sound/weapons/egloves.ogg', 80, 1)