Weapon, pickaxe and shield resprite (and a bunch of other stuff) (#6776)

this resprites some weapons,

namely the butterfly knife and switchblade to not be comically oversized
(you know, they're...concealable.)
tweaks some other sprites too, like the handles of polearms and the stunbaton
this doesn't change how they look from afar, they're practically the same in glance value
riot shield taken from Eris (and tactical shield is a modified version of that)
made ebarrier use same colors as eshield (this makes more sense, honestly)

code/modules/materials/material_sheets.dm

@@ -123,8 +123,10 @@
 /obj/item/stack/material/plastic
 	name = "plastic"
 	icon_state = "sheet-plastic"
+	item_state = "sheet-plastic"
 	default_type = "plastic"
 	icon_has_variants = TRUE
+	drop_sound = 'sound/items/drop/card.ogg'
 
 /obj/item/stack/material/gold
 	name = "gold"
@@ -213,7 +215,7 @@
 	icon_state = "sheet-leather"
 	default_type = "leather"
 	icon_has_variants = TRUE
-	drop_sound = 'sound/items/drop/clothing.ogg'
+	drop_sound = 'sound/items/drop/leather.ogg'
 
 /obj/item/stack/material/glass
 	name = "glass"
@@ -231,6 +233,7 @@
 /obj/item/stack/material/glass/reinforced
 	name = "reinforced glass"
 	icon_state = "sheet-rglass"
+	item_state = "sheet-rglass"
 	default_type = "rglass"
 
 /obj/item/stack/material/glass/phoronglass
@@ -238,6 +241,7 @@
 	desc = "This sheet is special platinum-glass alloy designed to withstand large temperatures"
 	singular_name = "borosilicate glass sheet"
 	icon_state = "sheet-phoronglass"
+	item_state = "sheet-pglass"
 	default_type = "borosilicate glass"
 
 /obj/item/stack/material/glass/phoronrglass
@@ -245,6 +249,7 @@
 	desc = "This sheet is special platinum-glass alloy designed to withstand large temperatures. It is reinforced with few rods."
 	singular_name = "reinforced borosilicate glass sheet"
 	icon_state = "sheet-phoronrglass"
+	item_state = "sheet-prglass"
 	default_type = "reinforced borosilicate glass"
 
 /obj/item/stack/material/bronze