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/server/server.py

@@ -7,7 +7,6 @@ sets up all the networking features.  (this is done automatically
 by evennia/server/server_runner.py).
 
 """
-from builtins import object
 import time
 import sys
 import os