Some more fixes for signs and related stuff. (#50752)

* inhand icons

* Adding to the object, forgot to name one icon.

* Fixing some stuff, and creating inhand icons.

* Fixes a thing I broke.

* Fixes things (including ALL posters) that shouldn't be wrenchable being wrenchable. Plaques now transfer icon_state always.

* Picture frames, painting frames, and the monkey portrait are now wooden.

* Fountain pens can now be uncommonly found in maint.

* Uneditable sign types should not become editable when unwrenched.

* Move redefined var above newly defined var.

code/game/objects/structures/plaques/_plaques.dm

@@ -17,6 +17,9 @@
 /obj/item/plaque //The item version of the above.
 	icon = 'icons/obj/decals.dmi'
 	icon_state = "blankplaque"
+	item_state = "blankplaque"
+	lefthand_file = 'icons/mob/inhands/items_lefthand.dmi'
+	righthand_file = 'icons/mob/inhands/items_righthand.dmi'
 	name = "blank plaque"
 	desc = "A blank plaque, use a fancy pen to engrave it. It can be placed on a wall."
 	w_class = WEIGHT_CLASS_NORMAL
@@ -49,6 +52,7 @@
 		unwrenched_plaque.name = name //Copy over the plaque structure variables to the plaque item we're creating when we unwrench it.
 		unwrenched_plaque.desc = desc
 		unwrenched_plaque.engraved = engraved
+	unwrenched_plaque.icon_state = icon_state
 	unwrenched_plaque.obj_integrity = obj_integrity
 	unwrenched_plaque.setDir(dir)
 	qdel(src) //The plaque structure on the wall goes poof and only the plaque item from unwrenching remains.
@@ -178,6 +182,7 @@
 		placed_plaque.name = name
 		placed_plaque.desc = desc
 		placed_plaque.engraved = engraved
+	placed_plaque.icon_state = icon_state
 	placed_plaque.obj_integrity = obj_integrity
 	placed_plaque.setDir(dir)
 	qdel(src)

code/game/objects/structures/plaques/static_plaques.dm

@@ -19,7 +19,7 @@
 /obj/structure/plaque/static_plaque/golden/captain
 	name = "The Most Robust Captain Award for Robustness"
 
-//These are plaques that aren't made of metal, so we'll just consider them signs. Those are made of plastic, not gold.
+//These are plaques that aren't made of metal, so we'll just consider them signs. Those are made of plastic (default) or wood, not gold.
 //See: code>game>objects>structures>signs>_signs.dm
 
 /obj/structure/sign/plaques/kiddie
@@ -47,3 +47,4 @@
 	name = "\improper Mr. Deempisi portrait"
 	desc = "Under the painting a plaque reads: 'While the meat grinder may not have spared you, fear not. Not one part of you has gone to waste... You were delicious.'"
 	icon_state = "monkey_painting"
+	custom_materials = list(/datum/material/wood = 2000) //The same as /obj/structure/sign/picture_frame