The function set_item_opts sets all the given item's option bits
(menu option bits may be logically-OR'ed together).
The function item_opts_on turns on the given option bits, and leaves
The function item_opts_off turns off the given option bits, and
leaves others alone.
The function item_opts returns the item's current option bits.
There is only one defined option bit mask, O_SELECTABLE. When this
is on, the item may be selected during menu processing. This option
defaults to on.
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