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/game/objects/items/weapons/material/knives.dm

@@ -30,6 +30,7 @@
 	desc = "The unearthly energies that once powered this blade are now dormant."
 	icon = 'icons/obj/wizard.dmi'
 	icon_state = "render"
+	item_state = "knife"
 	applies_material_colour = 0
 
 /obj/item/weapon/material/knife/bayonet

code/game/objects/items/weapons/material/misc.dm

@@ -60,7 +60,7 @@
 	attack_verb = list("slashed", "sliced", "cut", "clawed")
 
 /obj/item/weapon/material/scythe
-	icon_state = "scythe0"
+	icon_state = "scythe"
 	name = "scythe"
 	desc = "A sharp and curved blade on a long fibremetal handle, this tool makes it easy to reap what you sow."
 	force_divisor = 0.275 // 16 with hardness 60 (steel)