API CHANGE (new action):

sysadm/moused, "action"="list_devices_active": This will return a list of all the devices which are currently active.
-------------

REST Request (example):
-------------------------------
PUT /sysadm/moused
{
   "action" : "list_devices_active"
}

WebSocket Request:
-------------------------------
{
   "name" : "moused",
   "namespace" : "sysadm",
   "id" : "fooid",
   "args" : {
      "action" : "list_devices_active"
   }
}

Response:
-------------------------------
{
  "args": {
    "list_devices_active": {
      "active_devices": [
        "ums0"
      ]
    }
  },
  "id": "fooid",
  "name": "response",
  "namespace": "sysadm"
}

src/server/WebBackend.cpp

@@ -1225,6 +1225,8 @@ RestOutputStruct::ExitCode WebSocket::EvaluateSysadmMousedRequest(const QJsonVal
   QJsonObject outobj;
   if(action == "list_devices"){
     outobj = sysadm::moused::listDevices();
+  }else if(action == "list_devices_active"){
+    outobj = sysadm::moused::listActiveDevices();
   }else if(action == "list_device_options"){
     outobj = sysadm::moused::listOptions();
   }else if(action == "read_device_options"){