inkey() now returns CP437 characters by default

K_CP437 changed to K_UTF8 with the inverted logic. If you have code/script
that can handle UTF-8 input, then you need to specify K_UTF8 in calls to
inkey, getkey, getstr. Or else, you're going to get a CP437 translated
version of any non-ASCII (UNICODE) UTF-8 chars, if there's a mapping
available. This only impacts UTF-8 terminals.

There are just so many places in Synchronet where UTF-8 input could cause
problems, it makes sense to translate UTF-8 to CP437 by default and make
true UNICODE/UTF-8 handling the exception.

Sorry Nightfox, you'll need to remove the K_CP437 detection/use code you
just added to SlyEdit.