Add version-upgrader to 5.10

Nescesary because of the updated overhang wall-speed setting.

part of CURA-12352

plugins/VersionUpgrade/VersionUpgrade59to510/VersionUpgrade59to510.py

@@ -0,0 +1,68 @@
+import configparser
+import io
+from typing import Dict, Tuple, List
+
+from UM.VersionUpgrade import VersionUpgrade
+
+_RENAMED_SETTINGS = {
+    "wall_overhang_speed_factor": "wall_overhang_speed_factors"
+}  # type: Dict[str, str]
+
+_NEW_SETTING_VERSION = "25"
+
+
+class VersionUpgrade59to510(VersionUpgrade):
+    def upgradePreferences(self, serialized: str, filename: str):
+        parser = configparser.ConfigParser(interpolation = None)
+        parser.read_string(serialized)
+
+        # Fix 'renamed'(ish) settings for visibility
+        if "visible_settings" in parser["general"]:
+            all_setting_keys = parser["general"]["visible_settings"].strip().split(";")
+            if all_setting_keys:
+                for idx, key in enumerate(all_setting_keys):
+                    if key in _RENAMED_SETTINGS:
+                        all_setting_keys[idx] = _RENAMED_SETTINGS[key]
+                parser["general"]["visible_settings"] = ";".join(all_setting_keys)
+
+        # Update version number.
+        parser["metadata"]["setting_version"] = _NEW_SETTING_VERSION
+
+        result = io.StringIO()
+        parser.write(result)
+        return [filename], [result.getvalue()]
+
+    def upgradeInstanceContainer(self, serialized: str, filename: str) -> Tuple[List[str], List[str]]:
+        parser = configparser.ConfigParser(interpolation = None, comment_prefixes = ())
+        parser.read_string(serialized)
+
+        # Update version number.
+        parser["metadata"]["setting_version"] = _NEW_SETTING_VERSION
+
+        if "values" in parser:
+            for old_name, new_name in _RENAMED_SETTINGS.items():
+                if old_name in parser["values"]:
+                    parser["values"][new_name] = parser["values"][old_name]
+                    del parser["values"][old_name]
+            if "wall_overhang_speed_factors" in parser["values"]:
+                old_value = float(parser["values"]["wall_overhang_speed_factors"])
+                new_value = [max(1, int(round(old_value)))]
+                parser["values"]["wall_overhang_speed_factor"] = str(new_value)
+
+        result = io.StringIO()
+        parser.write(result)
+        return [filename], [result.getvalue()]
+
+    def upgradeStack(self, serialized: str, filename: str) -> Tuple[List[str], List[str]]:
+        parser = configparser.ConfigParser(interpolation = None)
+        parser.read_string(serialized)
+
+        # Update version number.
+        if "metadata" not in parser:
+            parser["metadata"] = {}
+
+        parser["metadata"]["setting_version"] = _NEW_SETTING_VERSION
+
+        result = io.StringIO()
+        parser.write(result)
+        return [filename], [result.getvalue()]