make sim global; make nonessential queues optional

sim/wire.lua

@@ -10,13 +10,12 @@ FFI.cdef[[
 	};
 ]]
 
-function Wire.new(self, objref, layer, bounds, sim)
+function Wire.new(self, objref, layer, bounds)
 	local o = {
 		objref = objref,
 		layer = layer,
 		group = nil,
 		bounds = bounds,
-		sim = sim,
 	}
 	setmetatable(o, self)
 	self.__index = self
@@ -28,7 +27,7 @@ function Wire.setlayer(self, layer)
 		Group.removewire(self.group, self)
 	end
 	self.layer = layer
-	Simulation.connectwire(Wire.getsim(self), self)
+	Simulation.connectwire(GSim, self)
 end
 
 function Wire.update(self)
@@ -54,7 +53,3 @@ end
 function Wire.getbounds(self)
 	return self.bounds
 end
-
-function Wire.getsim(wire)
-	return wire.sim
-end