API CHANGE: 5 simple "actions" for sysadm/firewall

Add five new "actions" for managing the firewall:
"start" - turn on the firewall
"stop" - turn off the firewall
"restart" - reload the firewall (catches any settings changes - not generally needed)
"enable" - automatically start the firewall on bootup
"disable" - do not start the firewall on bootup

They all use the same input/output syntax, just the "action" input field is different

REST Request (example):
-------------------------------
PUT /sysadm/firewall
{
   "action" : "restart"
}

WebSocket Request:
-------------------------------
{
   "id" : "fooid",
   "args" : {
      "action" : "restart"
   },
   "namespace" : "sysadm",
   "name" : "firewall"
}

Response:
-------------------------------
{
  "args": {
    "result": "success"
  },
  "id": "fooid",
  "name": "response",
  "namespace": "sysadm"
}

src/server/WebBackend.cpp

@@ -1170,6 +1170,26 @@ RestOutputStruct::ExitCode WebSocket::EvaluateSysadmFirewallRequest(const QJsonV
       FMGR.ClosePort(P);
     }
 
+  }else if(action=="start"){
+    ok = true;
+    FMGR.Start();
+
+  }else if(action=="stop"){
+    ok = true;
+    FMGR.Stop();
+
+  }else if(action=="restart"){
+    ok = true;
+    FMGR.Restart();
+
+  }else if(action=="enable"){
+    ok = true;
+    FMGR.Enable();
+
+  }else if(action=="disable"){
+    ok = true;
+    FMGR.Disable();
+
   }