Guncode Agony 4.2: Firing Effect Intervallo (#88072)

## About The Pull Request

Firing effects now attach themselves to the firer, meaning you don't run
over or back from your own muzzle flash if you fire while running.

## Why It's Good For The Game

Look better, both when moving into and away from the effect.

## Changelog
🆑
image: Muzzle flash now is attached to your sprite, meaning you won't
run over it if you fire while moving
/🆑

code/game/objects/effects/temporary_visuals/miscellaneous.dm

@@ -57,6 +57,12 @@
 	icon_state = "firing_effect"
 	duration = 3
 
+/obj/effect/temp_visual/dir_setting/firing_effect/Initialize(mapload, set_dir)
+	. = ..()
+	if (ismovable(loc))
+		var/atom/movable/spawned_inside = loc
+		spawned_inside.vis_contents += src
+
 /obj/effect/temp_visual/dir_setting/firing_effect/setDir(newdir)
 	switch(newdir)
 		if(NORTH)