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/commands/default/account.py

@@ -18,8 +18,6 @@ self.msg() and similar methods to reroute returns to the correct
 method. Otherwise all text will be returned to all connected sessions.
 
 """
-from builtins import range
-
 import time
 from codecs import lookup as codecs_lookup
 from django.conf import settings

evennia/commands/default/batchprocess.py

@@ -18,7 +18,6 @@ therefore always be limited to superusers only.
 
 """
 import re
-from builtins import range
 
 from django.conf import settings
 from evennia.utils.batchprocessors import BATCHCMD, BATCHCODE

evennia/commands/default/building.py

@@ -1,8 +1,6 @@
 """
 Building and world design commands
 """
-from builtins import range
-
 import re
 from django.conf import settings
 from django.db.models import Q