[Toybox] [PATCH] Improve signal name<->number conversions.

[enh]

Include all the signals, not just the POSIX ones.

In particular, improve support for real-time signals. My attempt to
switch AOSP builds over to toybox timeout got reverted when I broke the
ART build bots which use SIGRTMIN+2.

Also fix `kill -l 3` to show "QUIT" and `kill -l QUIT` to show "3".

Also make the `kill -l` output include numbers and names, and format it
to look better on a 80x24 tty, because it's always August 1978 somewhere.
---
 lib/lib.c          | 81 +++++++++++++++++++++++++++++++++++++---------
 lib/lib.h          |  2 ++
 toys/lsb/killall.c |  2 +-
 toys/posix/kill.c  |  5 +--
 4 files changed, 71 insertions(+), 19 deletions(-)
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