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/scripts/models.py

@@ -24,8 +24,6 @@ Common examples of uses of Scripts:
 - Give the account/object a time-limited bonus/effect
 
 """
-from builtins import object
-
 from django.conf import settings
 from django.db import models
 from django.core.exceptions import ObjectDoesNotExist