Updates Tools

Adds toolspeed var, which is a multiplier on how 'fast' the tool works.  0.5 means it goes twice as fast.
Adds usesound var, which determines what sound is used when a tool is being used.
Changes a lot of code to use those two vars instead.
Adds 'ayyy' tools, which are ported from /tg/'s abductor gamemode.  They're currently admin only but I might make them obtainable by xenoarch later.
Adds powertools, also from /tg/.  CE starts with them in a new toolbelt that spawns in their locker, ported from (you guessed it) /tg/.
Changes welder sprites to look nicer, ported yet again from /tg/.  Modified the blue welder slightly so it can be the electric welder sprite.
Adds various sounds from /tg/, for tools and welders.

code/game/objects/items/devices/hacktool.dm

@@ -23,10 +23,10 @@
 	hack_state = null
 	return ..()
 
-/obj/item/device/multitool/hacktool/attackby(var/obj/W, var/mob/user)
+/obj/item/device/multitool/hacktool/attackby(var/obj/item/W, var/mob/user)
 	if(isscrewdriver(W))
 		in_hack_mode = !in_hack_mode
-		playsound(src.loc, 'sound/items/Screwdriver.ogg', 50, 1)
+		playsound(src.loc, W.usesound, 50, 1)
 	else
 		..()