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SignalsPanel_new now fetches SIGRTMIN and SIGRTMAX and generates real-
time signals entries at runtime.

All signals between SIGRTMIN and SIGRTMAX are written in "SIGRTMIN+n"
notation, per discussion in pull request #551.

Signed-off-by: Kang-Che Sung <explorer09 @ gmail.com>

FreeBSD
Linux
Other platforms will have it undefined for now.

Implementations for Linux (tested) and FreeBSD (still untested, thanks to @etosan for providing the table).
Darwin and OpenBSD(ping @mmcco) builds should be broken now, pending their own tables.

Changes in object model: separate class objects to store vtable. Also, nicer UTF-8 display of big numbers.

Factored code from the SignalsPanel to apply to all selections from main screen.
Closes feature request #3425304.

Reduces resulting code size.

Add CPU affinity screen ('a' key).
BUGFIX: Correct display of TPGID field.
Add TGID field.