Adds Variable Click Delay

Now certain weapons can strike faster or slower than usual. No weapons currently do this as this PR just lays the groundwork for that.
The click delay can also be modified with traits. The slime agility modifier makes attacks happen 25% sooner.
Adds debug test verb to display a weapon's DPS. It's really basic but should be sufficient for future force adjustments I might do in the future.

code/game/objects/items.dm

@@ -80,6 +80,7 @@
 	var/list/sprite_sheets_obj = list()
 
 	var/toolspeed = 1.0 // This is a multipler on how 'fast' a tool works.  e.g. setting this to 0.5 will make the tool work twice as fast.
+	var/attackspeed = DEFAULT_ATTACK_COOLDOWN // How long click delay will be when using this, in 1/10ths of a second. Checked in the user's get_attack_speed().
 	var/addblends // Icon overlay for ADD highlights when applicable.
 
 /obj/item/New()
@@ -457,7 +458,7 @@ var/list/global/slot_flags_enumeration = list(
 	M.attack_log += "\[[time_stamp()]\]<font color='orange'> Attacked by [user.name] ([user.ckey]) with [src.name] (INTENT: [uppertext(user.a_intent)])</font>"
 	msg_admin_attack("[user.name] ([user.ckey]) attacked [M.name] ([M.ckey]) with [src.name] (INTENT: [uppertext(user.a_intent)]) (<A HREF='?_src_=holder;adminplayerobservecoodjump=1;X=[user.x];Y=[user.y];Z=[user.z]'>JMP</a>)") //BS12 EDIT ALG
 
-	user.setClickCooldown(DEFAULT_ATTACK_COOLDOWN)
+	user.setClickCooldown(user.get_attack_speed())
 	user.do_attack_animation(M)
 
 	src.add_fingerprint(user)