Remove builtins imports

This module is not intended to be used directly in most cases, per:
https://docs.python.org/3/library/builtins.html

None of our usages warrant the explicit import. We also avoid some
confusion as folks dig to see what we are doing to require
importing builtins directly.

evennia/objects/objects.py

@@ -7,7 +7,6 @@ entities.
 """
 import time
 import inflect
-from builtins import object
 from collections import defaultdict
 
 from django.conf import settings