Core: update cx-Freeze to 8.0.0 & Worlds: fix packages missing __init__.py (#4773)

setup.py

@@ -19,7 +19,7 @@ from typing import Dict, Iterable, List, Optional, Sequence, Set, Tuple, Union
 
 
 # This is a bit jank. We need cx-Freeze to be able to run anything from this script, so install it
-requirement = 'cx-Freeze==7.2.0'
+requirement = 'cx-Freeze==8.0.0'
 try:
     import pkg_resources
     try:

test/general/test_packages.py

@@ -0,0 +1,14 @@
+import unittest
+import os
+
+
+class TestPackages(unittest.TestCase):
+    def test_packages_have_init(self):
+        """Test that all world folders containing .py files also have a __init__.py file,
+        to indicate full package rather than namespace package."""
+        import Utils
+
+        worlds_path = Utils.local_path("worlds")
+        for dirpath, dirnames, filenames in os.walk(worlds_path):
+            with self.subTest(directory=dirpath):
+                self.assertEqual("__init__.py" in filenames, any(file.endswith(".py") for file in filenames))