Revert "Revert CURA-8055 in the 4.10 branch. This should not have been merged in there."

This reverts commit 4d29de4579.
Effectively this re-applies the changes for CURA-8055 / #9957.

resources/definitions/ultimaker2_plus_connect.def.json

@@ -22,7 +22,8 @@
             "0": "ultimaker2_plus_connect_extruder_0"
         },
         "supports_usb_connection": false,
-        "supports_network_connection": true
+        "supports_network_connection": true,
+        "supports_material_export": true
     },
 
     "overrides": {

resources/definitions/ultimaker_s3.def.json

@@ -27,6 +27,7 @@
         "first_start_actions": [ "DiscoverUM3Action" ],
         "supported_actions": [ "DiscoverUM3Action" ],
         "supports_usb_connection": false,
+        "supports_material_export": true,
         "weight": -1,
         "firmware_update_info": {
             "id": 213482,

resources/definitions/ultimaker_s5.def.json

@@ -28,6 +28,7 @@
         "supported_actions": [ "DiscoverUM3Action" ],
         "supports_usb_connection": false,
         "supports_network_connection": true,
+        "supports_material_export": true,
         "weight": -2,
         "firmware_update_info": {
             "id": 9051,

resources/qml/Preferences/Materials/MaterialsPage.qml

@@ -1,5 +1,5 @@
-// Copyright (c) 2018 Ultimaker B.V.
-// Uranium is released under the terms of the LGPLv3 or higher.
+// Copyright (c) 2021 Ultimaker B.V.
+// Cura is released under the terms of the LGPLv3 or higher.
 
 import QtQuick 2.7
 import QtQuick.Controls 1.4
@@ -191,6 +191,20 @@ Item
             }
             enabled: base.hasCurrentItem
         }
+
+        //Sync button.
+        Button
+        {
+            id: syncMaterialsButton
+            text: catalog.i18nc("@action:button Sending materials to printers", "Sync with Printers")
+            iconName: "sync-synchronizing"
+            onClicked:
+            {
+                forceActiveFocus();
+                exportAllMaterialsDialog.open();
+            }
+            visible: Cura.MachineManager.activeMachine.supportsMaterialExport
+        }
     }
 
     Item {
@@ -368,6 +382,20 @@ Item
         }
     }
 
+    FileDialog
+    {
+        id: exportAllMaterialsDialog
+        title: catalog.i18nc("@title:window", "Export All Materials")
+        selectExisting: false
+        nameFilters: ["Material archives (*.umm)", "All files (*)"]
+        folder: base.materialManagementModel.preferredExportAllPath
+        onAccepted:
+        {
+            base.materialManagementModel.exportAll(fileUrl);
+            CuraApplication.setDefaultPath("dialog_material_path", folder);
+        }
+    }
+
     MessageDialog
     {
         id: messageDialog