ADD: added possibility to drag marker and get the new position for updating a entity

webapp/src/App.jsx

@@ -29,7 +29,7 @@ const client = new W3CWebSocket("ws://"+config.apiUrl+":"+config.apiProt+"/");
 class App extends Component {
   state =  {
     Entities: [],
-    EntityOnFocus: []
+    EntityOnFocus: undefined
   }
   
   componentDidMount() {
@@ -41,7 +41,7 @@ class App extends Component {
 
     client.onmessage = (message) => {
       const dataFromServer = JSON.parse(message.data);
-      console.log('reply: ', dataFromServer);
+      // console.log('reply: ', dataFromServer);
 
       if(dataFromServer.Data === "COP")
       {
@@ -97,6 +97,7 @@ class App extends Component {
 
     setEntityOnFocus(Entity)
     {
+
       // console.log(Entity);
       this.setState({
         EntityOnFocus: Entity