thrown objects now phase through the thrower instead of hitting them (#12323)

code/controllers/subsystem/throwing.dm

@@ -142,7 +142,7 @@ SUBSYSTEM_DEF(throwing)
 /datum/thrownthing/proc/hitcheck()
 	for(var/thing in get_turf(thrownthing))
 		var/atom/movable/AM = thing
-		if(AM == thrownthing)
+		if(AM == thrownthing || AM == thrower)
 			continue
 		if(AM.density && !(AM.pass_flags & LETPASSTHROW) && !(AM.flags & ON_BORDER))
 			finalize(hit = TRUE, target = AM)

code/modules/mob/mob_movement.dm

@@ -2,7 +2,7 @@
 	if(height==0)
 		return 1
 	if(istype(mover, /obj/item/projectile) || mover.throwing)
-		return (!density || lying)
+		return (mover.throwing.thrower == src || !density || lying)
 	if(mover.checkpass(PASSMOB))
 		return 1
 	if(buckled == mover)