Use version standard for --version output

[ericwb]

Is your feature request related to a problem? Please describe.
The GNU documentation has a standard around the output of --version. See https://www.gnu.org/prep/standards/html_node/_002d_002dversion.html

Describe the solution you'd like

1. The program’s name should be a constant string; don’t compute it from argv[0].
2. Add the copyright to the output
3. Add the license to the output

Describe alternatives you've considered
n/a

Additional context
n/a

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