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/manager.py

@@ -8,7 +8,6 @@ from django.conf import settings
 from django.db.models.fields import exceptions
 from evennia.typeclasses.managers import TypedObjectManager, TypeclassManager
 from evennia.utils.utils import is_iter, make_iter, string_partial_matching
-from builtins import int
 
 __all__ = ("ObjectManager",)
 _GA = object.__getattribute__