use get/set for parameters on ports and wires

sim/wire.lua

@@ -26,3 +26,23 @@ end
 function Wire.update(self)
 	client:send("WU\t" .. bool_to_int[self.group.state] .. "\t" .. self.objref .. "\n")
 end
+
+function Wire.setgroup(self, group)
+	self.group = group
+end
+
+function Wire.getgroup(self)
+	return self.group
+end
+
+function Wire.getobjref(self)
+	return self.objref
+end
+
+function Wire.getlayer()
+	return self.layer
+end
+
+function Wire.getbounds(wire)
+	return self.bounds
+end