fences can be shot through (#6178)

# About the pull request

gives a flag for fences to make bullets gas and spits (not throwables)
pass cades
# Explain why it's good for the game

being unable to shoot thrue fences is a bit weard, might prove OP so TM
first and there might be need for changes or rewert


# Testing Photographs and Procedure
<details>
<summary>Screenshots & Videos</summary>

Put screenshots and videos here with an empty line between the
screenshots and the `<details>` tags.

</details>


# Changelog
:cl:
balance: projectiles can pass fences
/:cl:

Co-authored-by: vincibrv <[email protected]>

code/game/objects/structures/fence.dm

@@ -3,6 +3,7 @@
 	desc = "A large metal mesh strewn between two poles. Intended as a cheap way to separate areas, while allowing one to see through it."
 	icon = 'icons/obj/structures/props/fence.dmi'
 	icon_state = "fence0"
+	throwpass = TRUE
 	density = TRUE
 	anchored = TRUE
 	layer = WINDOW_LAYER