[Toybox] [PATCH] vi: semi-functional ^E/^U and ^F/^B.

[enh]

The forward movement seems okay (no worse than the equivalent arrow key
movement), but I haven't yet worked out how to move the cursor back when
necessary.

Also fix the location of the cursor in ex mode, and stop showing ex
commands in bold.
---
 toys/pending/vi.c | 30 +++++++++++++++++++++++++-----
 1 file changed, 25 insertions(+), 5 deletions(-)
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