Added the advanced settings page

- added a button to scan the server for installed containers
- added a check on the presence of installed containers before configuring the server, if the containers are already installed, then we will add them to the GUI
- added new control element - PopupWarning.qml

client/ui/qml/main.qml

@@ -230,6 +230,10 @@ Window  {
         function onToggleLogPanel() {
             drawer_log.visible = !drawer_log.visible
         }
+        function onShowWarningMessage(message) {
+            popupWarning.popupWarningText = message
+            popupWarning.open()
+        }
     }
 
     MessageDialog {
@@ -353,4 +357,8 @@ Window  {
             }
         }
     }
+
+    PopupWarning {
+        id: popupWarning
+    }
 }