disable_commands() - makes a living object non-living
int disable_commands( void );
Makes a living object non-living, that is, add_actions have no effects,
livingp returns false, and, if the object is interactive, disallows the
user to type in commands other than for an input_to. disable_commands
always returns 0.
calling disable_commands() also have side-effct of clearing all actions
previously added by other object, it also removes actions that was
defined by this object.
enable_commands(3)