[Toybox] [PATCH] vi: fix warnings, improve status display.

[enh]

mbtowc(0, 0, 4) is weird, and ignoring the result is weird. Avoid all
this by just reusing the toybox lib utf8 functions.

Also fix the row/column display on the status line to count from 1 and
correctly distinguish bytes and characters in non-ASCII, and change the
mode output to only explicitly say when we're in insert mode, in the
same way that vim does. (Every time I saw the old blue-on-black text for
COMMAND I thought toybox vi had crashed!)
---
 toys/pending/vi.c | 93 +++++++++++------------------------------------
 1 file changed, 22 insertions(+), 71 deletions(-)
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