Add typing for all version upgrade plug-ins

Hopefully we'll take this typing along when we next copy-paste the stuffs.

Contributes to issue CURA-5936.

plugins/VersionUpgrade/VersionUpgrade25to26/VersionUpgrade25to26.py

@@ -4,6 +4,7 @@
 import configparser #To parse the files we need to upgrade and write the new files.
 import io #To serialise configparser output to a string.
 import os
+from typing import Dict, List, Set, Tuple
 from urllib.parse import quote_plus
 
 from UM.Resources import Resources
@@ -12,19 +13,18 @@ from UM.VersionUpgrade import VersionUpgrade
 _removed_settings = { #Settings that were removed in 2.5.
     "start_layers_at_same_position",
     "sub_div_rad_mult"
-}
+} # type: Set[str]
 
 _split_settings = { #These settings should be copied to all settings it was split into.
     "support_interface_line_distance": {"support_roof_line_distance", "support_bottom_line_distance"}
-}
+} # type: Dict[str, Set[str]]
 
 ##  A collection of functions that convert the configuration of the user in Cura
 #   2.5 to a configuration for Cura 2.6.
 #
 #   All of these methods are essentially stateless.
 class VersionUpgrade25to26(VersionUpgrade):
-
-    def __init__(self):
+    def __init__(self) -> None:
         super().__init__()
         self._current_fdm_printer_count = 2
 
@@ -39,7 +39,7 @@ class VersionUpgrade25to26(VersionUpgrade):
     #   \raises ValueError The format of the version number in the file is
     #   incorrect.
     #   \raises KeyError The format of the file is incorrect.
-    def getCfgVersion(self, serialised):
+    def getCfgVersion(self, serialised: str) -> int:
         parser = configparser.ConfigParser(interpolation = None)
         parser.read_string(serialised)
         format_version = int(parser.get("general", "version")) #Explicitly give an exception when this fails. That means that the file format is not recognised.
@@ -50,7 +50,7 @@ class VersionUpgrade25to26(VersionUpgrade):
     #
     #   \param serialised The serialised form of a preferences file.
     #   \param filename The name of the file to upgrade.
-    def upgradePreferences(self, serialised, filename):
+    def upgradePreferences(self, serialised: str, filename: str) -> Tuple[List[str], List[str]]:
         parser = configparser.ConfigParser(interpolation = None)
         parser.read_string(serialised)
 
@@ -86,7 +86,7 @@ class VersionUpgrade25to26(VersionUpgrade):
     #
     #   \param serialised The serialised form of a quality profile.
     #   \param filename The name of the file to upgrade.
-    def upgradeInstanceContainer(self, serialised, filename):
+    def upgradeInstanceContainer(self, serialised: str, filename: str) -> Tuple[List[str], List[str]]:
         parser = configparser.ConfigParser(interpolation = None)
         parser.read_string(serialised)
 
@@ -116,7 +116,7 @@ class VersionUpgrade25to26(VersionUpgrade):
     #
     #   \param serialised The serialised form of a quality profile.
     #   \param filename The name of the file to upgrade.
-    def upgradeMachineStack(self, serialised, filename):
+    def upgradeMachineStack(self, serialised: str, filename: str) -> Tuple[List[str], List[str]]:
         parser = configparser.ConfigParser(interpolation = None)
         parser.read_string(serialised)
 
@@ -149,7 +149,7 @@ class VersionUpgrade25to26(VersionUpgrade):
         return [filename], [output.getvalue()]
 
     ##  Acquires the next unique extruder stack index number for the Custom FDM Printer.
-    def _acquireNextUniqueCustomFdmPrinterExtruderStackIdIndex(self):
+    def _acquireNextUniqueCustomFdmPrinterExtruderStackIdIndex(self) -> int:
         extruder_stack_dir = os.path.join(Resources.getDataStoragePath(), "extruders")
         file_name_list = os.listdir(extruder_stack_dir)
         file_name_list = [os.path.basename(file_name) for file_name in file_name_list]
@@ -169,7 +169,7 @@ class VersionUpgrade25to26(VersionUpgrade):
 
         return self._current_fdm_printer_count
 
-    def _checkCustomFdmPrinterHasExtruderStack(self, machine_id):
+    def _checkCustomFdmPrinterHasExtruderStack(self, machine_id: str) -> bool:
         # go through all extruders and make sure that this custom FDM printer has extruder stacks.
         extruder_stack_dir = os.path.join(Resources.getDataStoragePath(), "extruders")
         has_extruders = False
@@ -197,7 +197,7 @@ class VersionUpgrade25to26(VersionUpgrade):
 
         return has_extruders
 
-    def _createCustomFdmPrinterExtruderStack(self, machine_id: str, position: int, quality_id: str, material_id: str):
+    def _createCustomFdmPrinterExtruderStack(self, machine_id: str, position: int, quality_id: str, material_id: str) -> None:
         stack_id = "custom_extruder_%s" % (position + 1)
         if self._current_fdm_printer_count > 1:
             stack_id += " #%s" % self._current_fdm_printer_count
@@ -256,7 +256,7 @@ class VersionUpgrade25to26(VersionUpgrade):
 
     ##  Creates a definition changes container which doesn't contain anything for the Custom FDM Printers.
     #   The container ID will be automatically generated according to the given stack name.
-    def _getCustomFdmPrinterDefinitionChanges(self, stack_id: str):
+    def _getCustomFdmPrinterDefinitionChanges(self, stack_id: str) -> configparser.ConfigParser:
         # In 2.5, there is no definition_changes container for the Custom FDM printer, so it should be safe to use the
         # default name unless some one names the printer as something like "Custom FDM Printer_settings".
         definition_changes_id = stack_id + "_settings"
@@ -277,7 +277,7 @@ class VersionUpgrade25to26(VersionUpgrade):
 
     ##  Creates a user settings container which doesn't contain anything for the Custom FDM Printers.
     #   The container ID will be automatically generated according to the given stack name.
-    def _getCustomFdmPrinterUserSettings(self, stack_id: str):
+    def _getCustomFdmPrinterUserSettings(self, stack_id: str) -> configparser.ConfigParser:
         # For the extruder stacks created in the upgrade, also create user_settings containers so the user changes
         # will be saved.
         user_settings_id = stack_id + "_user"