[Toybox] [PATCH] Add fmt.

[enh]

A very simple implementation of fmt, good enough for my daily use of !!fmt
in vi to reflow checkin comments like this.
---
 tests/fmt.test     | 21 +++++++++++++++
 toys/pending/fmt.c | 78 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 99 insertions(+)
 create mode 100755 tests/fmt.test
 create mode 100644 toys/pending/fmt.c
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