Basic upgrade module from 3.2 to 3.3 implementation

'Basic' meaning no implementation at all.

Contributes to issue CURA-5054.

plugins/VersionUpgrade/VersionUpgrade32to33/VersionUpgrade32to33.py

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+# Copyright (c) 2018 Ultimaker B.V.
+# Cura is released under the terms of the LGPLv3 or higher.
+
+import configparser #To parse preference files.
+import io #To serialise the preference files afterwards.
+
+from UM.VersionUpgrade import VersionUpgrade #We're inheriting from this.
+
+##  Upgrades configurations from the state they were in at version 3.2 to the
+#   state they should be in at version 3.3.
+class VersionUpgrade32to33(VersionUpgrade):
+    ##  Gets the version number from a CFG file.
+    def getCfgVersion(self, serialized):
+        raise NotImplementedError("This has not yet been implemented.")
+
+    ##  Upgrades a quality container to the new format.
+    def upgradeQuality(self, serialized, filename):
+        raise NotImplementedError("This has not yet been implemented.")

plugins/VersionUpgrade/VersionUpgrade32to33/__init__.py

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+# Copyright (c) 2018 Ultimaker B.V.
+# Cura is released under the terms of the LGPLv3 or higher.
+
+from . import VersionUpgrade32to33
+
+upgrade = VersionUpgrade32to33.VersionUpgrade32to33()
+
+def getMetaData():
+    return {
+        "version_upgrade": {
+            # From                    To                       Upgrade function
+            ("quality", 2000004):     ("quality", 3000004,     upgrade.upgradeQuality),
+        },
+        "sources": {
+            "quality": {
+                "get_version": upgrade.getCfgVersion,
+                "location": {"./quality"}
+            }
+        }
+    }
+
+def register(app):
+    return { "version_upgrade": upgrade }

plugins/VersionUpgrade/VersionUpgrade32to33/plugin.json

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+ {
+    "name": "Version Upgrade 3.2 to 3.3",
+    "author": "Ultimaker B.V.",
+    "version": "1.0.0",
+    "description": "Upgrades configurations from Cura 3.2 to Cura 3.3.",
+    "api": 4,
+    "i18n-catalog": "cura"
+}