Add version upgrade plug-in for 4.0 to 4.1

This currently only updates the stack files, but all files have to be upgraded because of that stupid setting_version.

Contributes to issue CURA-5848.

plugins/VersionUpgrade/VersionUpgrade40to41/__init__.py

@@ -0,0 +1,39 @@
+# Copyright (c) 2018 Ultimaker B.V.
+# Cura is released under the terms of the LGPLv3 or higher.
+
+from typing import Any, Dict, TYPE_CHECKING
+
+from . import VersionUpgrade40to41
+
+if TYPE_CHECKING:
+    from UM.Application import Application
+
+upgrade = VersionUpgrade40to41.VersionUpgrade40to41()
+
+def getMetaData() -> Dict[str, Any]:
+    return {
+        "version_upgrade": {
+            # From                           To                              Upgrade function
+            ("machine_stack", 4000005):      ("machine_stack", 4000006,      upgrade.upgradeStack),
+            ("extruder_train", 4000005):     ("extruder_train", 4000006,     upgrade.upgradeStack),
+            ("preferences", 6000005):        ("preferences", 6000006,        upgrade.upgradePreferences),
+            ("definition_changes", 4000005): ("definition_changes", 4000006, upgrade.upgradeInstanceContainer),
+            ("quality_changes", 4000005):    ("quality_changes", 4000006,    upgrade.upgradeInstanceContainer),
+            ("quality", 4000005):            ("quality", 4000006,            upgrade.upgradeInstanceContainer),
+            ("user", 4000005):               ("user", 4000006,               upgrade.upgradeInstanceContainer),
+        },
+        "sources": {
+            "machine_stack": {
+                "get_version": upgrade.getCfgVersion,
+                "location": {"./machine_instances"}
+            },
+            "extruder_train": {
+                "get_version": upgrade.getCfgVersion,
+                "location": {"./extruders"}
+            }
+        }
+    }
+
+
+def register(app: "Application") -> Dict[str, Any]:
+    return { "version_upgrade": upgrade }