Ticket #7510 (closed suggested feature: fixed)

Description

The patch below extends controls(), giving it the syntax controls(object,victim/attribute), which returns 1 if object could set (or edit) victim/attribute, and 0 if they couldn't, for any reason (no perms, safe, locked, too many attrs, etc). That would let softcoded globals for building, desc changers, etc, see if the player can set the attribute without having to try it with objeval() and check the modification time to see if it worked.