Partial UTF-8 line editing support for ksh(1) vi input mode;

so far, it covers these commands: a h i l x /
This is an isu8cont()-based hack similar in style to what i did
in emacs input mode, but less elegant and slightly more intrusive
because the vi mode code is much more ugly and less straightforward
than the emacs mode code.  This one required partial rewrites of
a few helper functions, and comments were added while there.

This is not perfect, but hopefully reduces people's cursing
until a more rigorous solution can be devised (much) later.
Some polishing may be useful in tree, in particular adding
utf8cont() support to a few missing commands.

Mostly written shortly after Christmas 2015.
Reminded by and OK czarkoff@.
Feedback, partial review and testing, no longer any objection by martijn@.
Feedback and testing by tb@.
Also read fine to nicm@.

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