coredumpctl: modernize table output

coredumpctl: modernize table output

Let's use our table formatter for generating the coredump table. Bring
support up to our current standards, with a bit of color, JSON output
and so on.

Also adds supports for setting a max for the number of lines to
generate. (with the new -n switch)

The existing -1 switch now becomes a synonym for "-n 1 --reverse"

Fixes: #3271