Hiding the knifing menu.

If player is
a) not hurt
b) not wielding the knife
c) not trying to cut wielded/worn equipment

then 'a'pplying a knife cuts the item up (cotton/leather/plastic/kevlar/wood). Otherwise,
a) menu with cauterization option
b), c) menu with cutting/carve writing options
will appear.

also refactoring/redundancy reduction, but especially iuse::knife is not or might not be as easily expandable as before.