Refactor IQ handling and merge payload iq struct fields for supported XEPs

xmpp/iot/control.go

@@ -2,16 +2,24 @@ package iot
 
 import "encoding/xml"
 
+/*
 type Control struct {
 	ControlSet     ControlSet     `xml:",omitempty"`
 	ControlGetForm ControlGetForm `xml:",omitempty"`
 }
 
+func (*Control) IQPayload() {
+}
+*/
+
 type ControlSet struct {
 	XMLName xml.Name       `xml:"urn:xmpp:iot:control set"`
 	Fields  []ControlField `xml:",any"`
 }
 
+func (*ControlSet) IsIQPayload() {
+}
+
 type ControlGetForm struct {
 	XMLName xml.Name `xml:"urn:xmpp:iot:control getForm"`
 }