move want_replies into new plugin system

src/plugins/NodeInfoPlugin.cpp

@@ -37,3 +37,13 @@ void NodeInfoPlugin::sendOurNodeInfo(NodeNum dest, bool wantReplies)
 
     service.sendToMesh(p);
 }
+
+
+/** Messages can be received that have the want_response bit set.  If set, this callback will be invoked
+ * so that subclasses can (optionally) send a response back to the original sender.  Implementing this method
+ * is optional
+ */
+void NodeInfoPlugin::sendResponse(NodeNum to) {
+    DEBUG_MSG("Sending user reply\n");
+    sendOurNodeInfo(to, false);
+}