Adds brass knuckles and more punching things (#4291)

This pr ports some things from polaris and vore:

-gloves can now increase unarmed attack, as well change their sharpness and etc
-adds brass knuckles, that you can wear on your glove slots and punch people for extra damage
-adds power fist, that allows you to push people around by punching their faces
-adds clawed gloves, that turns regular normie attacks into sharp ones
-adds a verbs that allows you to select a type of attack, like the language, so things like grues could select to use their claws instead of bites
-changes the price of the kneebreaker hammer

code/datums/uplink/highly visible and dangerous weapons.dm

@@ -36,7 +36,7 @@
 
 /datum/uplink_item/item/visible_weapons/hammer
 	name = "Kneebreaker Hammer"
-	item_cost = 10
+	item_cost = 7
 	path = /obj/item/weapon/melee/hammer
 
 /datum/uplink_item/item/visible_weapons/revolver
@@ -64,6 +64,16 @@
 	item_cost = 7
 	path = /obj/item/weapon/landmine/n2o
 
+/datum/uplink_item/item/visible_weapons/powerfist
+	name = "Power Fist"
+	item_cost = 4
+	path = /obj/item/clothing/gloves/powerfist
+
+/datum/uplink_item/item/visible_weapons/clawedgloves
+	name = "Clawed Gauntlets"
+	item_cost = 5
+	path = /obj/item/clothing/gloves/claws
+
 /datum/uplink_item/item/visible_weapons/heavysniper
 	name = "Anti-materiel Rifle"
 	item_cost = DEFAULT_TELECRYSTAL_AMOUNT