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/modules/blob/blob.dm

@@ -142,7 +142,7 @@
 		if("fire")
 			damage = (W.force / fire_resist)
 			if(istype(W, /obj/item/weapon/weldingtool))
-				playsound(loc, 'sound/items/Welder.ogg', 100, 1)
+				playsound(src, W.usesound, 100, 1)
 		if("brute")
 			damage = (W.force / brute_resist)