Don't depend on distutils

distutils are no longer available in Python 3.12. Therefore, we copy
the strtobool function from distutils to our own module. This is in
line with https://peps.python.org/pep-0632/#migration-advice.

Docs/CHANGELOG.md

@@ -15,6 +15,7 @@
 ## Upcoming
 * Improvements to the CarlaDataProvider:
  - Added `spawn_actor` for a blueprint based actor creation similar to `World.spawn_actor`
+* Allow using with Python 3.12
 
 ## CARLA ScenarioRunner 0.9.15
 ### :rocket: New Features

srunner/scenariomanager/actorcontrols/simple_vehicle_control.py

@@ -14,7 +14,7 @@
 - Can only consider obstacles in forward facing reaching (i.e. in tight corners obstacles may be ignored).
 """
 
-from distutils.util import strtobool
+from srunner.util import strtobool
 import math
 
 import carla

srunner/scenarios/open_scenario.py

@@ -11,7 +11,7 @@
 
 from __future__ import print_function
 
-from distutils.util import strtobool
+from srunner.util import strtobool
 import itertools
 import os
 import py_trees

srunner/tools/openscenario_parser.py

@@ -11,7 +11,7 @@
 
 from __future__ import print_function
 
-from distutils.util import strtobool
+from srunner.util import strtobool
 import re
 import copy
 import datetime

srunner/util.py

@@ -0,0 +1,14 @@
+def strtobool(val):
+    """Convert a string representation of truth to true (1) or false (0).
+
+    True values are 'y', 'yes', 't', 'true', 'on', and '1'; false values
+    are 'n', 'no', 'f', 'false', 'off', and '0'.  Raises ValueError if
+    'val' is anything else.
+    """
+    val = val.lower()
+    if val in ('y', 'yes', 't', 'true', 'on', '1'):
+        return 1
+    elif val in ('n', 'no', 'f', 'false', 'off', '0'):
+        return 0
+    else:
+        raise ValueError(f"invalid truth value {val!r}")