enable_commands() marks this_object() as a living object, and allows it
to use commands added with add_action() (by using command()). When
enable_commands() is called, the driver also looks for the local func‐
tion catch_tell(), and if found, it will call it every time a message
(via say() for example) is given to the object.
Since FluffOS 3.0-alpha7: This function now accept int, default to 0.
which has same meaning of old form. which merely re-enables commands,
but don't setup actions. (it should have been cleared when previously
When setup_actions > 0, Driver will re-setup all the actions by calling
init() on its environment, sibling and inventory objects. (in that