Adds hydroponics shrubs, allowing botanists to grow hedges. (#55496)

Replaces one of the rainbow seeds in the exotic seeds crate with a pack of shrub seeds.
Adds a new, growable seed species for shrubs. Shrubs, when planted (similar to kudzu!) plants a solid, weak barrier in hedges.
These hedges block vision, unless trimmed. Thankfully, we already have a hedge trimming skillchip, so using a sharp implement on the hedge will make it non-opaque.

code/game/objects/structures/fluff.dm

@@ -260,6 +260,16 @@
 	density = TRUE
 	anchored = TRUE
 	deconstructible = FALSE
+	max_integrity = 80
+
+/obj/structure/fluff/hedge/attacked_by(obj/item/I, mob/living/user)
+	if(opacity && HAS_TRAIT(user, TRAIT_BONSAI) && I.get_sharpness())
+		to_chat(user,"<span class='notice'>You start trimming \the [src].</span>")
+		if(do_after(user, 3 SECONDS,target=src))
+			to_chat(user,"<span class='notice'>You finish trimming \the [src].</span>")
+			opacity = FALSE
+	else
+		return ..()
 
 /obj/structure/fluff/hedge/opaque //useful for mazes and such
 	opacity = TRUE