revised callback system to use multiple arguments; added tobitstring function in utility

sim/simulation.lua

@@ -328,13 +328,11 @@ function Simulation:sendcallbacks()
 		local data = "CB"
 		
 		for objref, args in pairs(self.callbacks) do
-			local argc = 0
 			local escargs = {}
 			for argidx, argv in ipairs(args) do
 				table.insert(escargs, expandescape(tostring(argv)))
-				argc = argc+1
 			end
-			data = data .. "\t" .. objref .. "\t"..argc..(#escargs>0 and ("\t"..table.concat(escargs, "\t")) or "")
+			data = data .. "\t" .. objref .. "\t"..(#escargs)..(#escargs>0 and ("\t"..table.concat(escargs, "\t")) or "")
 		end
 		
 		client:send(data .. "\n")