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/typeclasses/attributes.py

@@ -8,7 +8,6 @@ which is a non-db version of Attributes.
 
 
 """
-from builtins import object
 import re
 import fnmatch
 import weakref

evennia/typeclasses/models.py

@@ -25,8 +25,6 @@ This module also contains the Managers for the respective models; inherit from
 these to create custom managers.
 
 """
-from builtins import object
-
 from django.db.models import signals
 
 from django.db.models.base import ModelBase

evennia/typeclasses/tags.py

@@ -9,7 +9,6 @@ used for storing Aliases and Permissions. This module contains the
 respective handlers.
 
 """
-from builtins import object
 from collections import defaultdict
 
 from django.conf import settings