Rename VersionUpgrade plug-in from 40 to 35

Because the next version is going to be called 3.5, not 4.0.

plugins/VersionUpgrade/VersionUpgrade34to35/VersionUpgrade34to35.py

@@ -60,8 +60,8 @@ _RENAMED_MATERIAL_PROFILES = {
 }
 
 ##  Upgrades configurations from the state they were in at version 3.4 to the
-#   state they should be in at version 4.0.
-class VersionUpgrade34to40(VersionUpgrade):
+#   state they should be in at version 3.5.
+class VersionUpgrade34to35(VersionUpgrade):
 
     ##  Gets the version number from a CFG file in Uranium's 3.3 format.
     #

plugins/VersionUpgrade/VersionUpgrade34to35/__init__.py

@@ -1,9 +1,9 @@
 # Copyright (c) 2018 Ultimaker B.V.
 # Cura is released under the terms of the LGPLv3 or higher.
 
-from . import VersionUpgrade34to40
+from . import VersionUpgrade34to35
 
-upgrade = VersionUpgrade34to40.VersionUpgrade34to40()
+upgrade = VersionUpgrade34to35.VersionUpgrade34to35()
 
 
 def getMetaData():

plugins/VersionUpgrade/VersionUpgrade34to35/plugin.json

@@ -1,8 +1,8 @@
  {
-    "name": "Version Upgrade 3.4 to 4.0",
+    "name": "Version Upgrade 3.4 to 3.5",
     "author": "Ultimaker B.V.",
     "version": "1.0.0",
-    "description": "Upgrades configurations from Cura 3.4 to Cura 4.0.",
+    "description": "Upgrades configurations from Cura 3.4 to Cura 3.5.",
     "api": 5,
     "i18n-catalog": "cura"
 }

plugins/VersionUpgrade/VersionUpgrade34to35/tests/TestVersionUpgrade34to35.py

@@ -4,12 +4,12 @@
 import configparser #To parse the resulting config files.
 import pytest #To register tests with.
 
-import VersionUpgrade34to40 #The module we're testing.
+import VersionUpgrade34to35 #The module we're testing.
 
 ##  Creates an instance of the upgrader to test with.
 @pytest.fixture
 def upgrader():
-    return VersionUpgrade34to40.VersionUpgrade34to40()
+    return VersionUpgrade34to35.VersionUpgrade34to35()
 
 test_upgrade_version_nr_data = [
     ("Empty config file",