copyright: update all copyright lines and remove year ranges

- they are mostly pointless in all major jurisdictions
- many big corporations and projects already don't use them
- save

copyright: update all copyright lines and remove year ranges

- they are mostly pointless in all major jurisdictions
- many big corporations and projects already don't use them
- saves us from pointless churn
- git keeps history for us
- the year range is kept in COPYING

checksrc is updated to allow non-year using copyright statements

Closes #10205

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copyright: make repository REUSE compliant

Add licensing and copyright information for all files in this repository. This
either happens in the file itself as a comment header or in the

copyright: make repository REUSE compliant

Add licensing and copyright information for all files in this repository. This
either happens in the file itself as a comment header or in the file
`.reuse/dep5`.

This commit also adds a Github workflow to check pull requests and adapts
copyright.pl to the changes.

Closes #8869

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timediff.[ch]: add curlx helper functions for timeval conversions

Also move timediff_t definitions from timeval.h to timediff.h and
then make timeval.h include the new standalone-capable

timediff.[ch]: add curlx helper functions for timeval conversions

Also move timediff_t definitions from timeval.h to timediff.h and
then make timeval.h include the new standalone-capable timediff.h.

Reviewed-by: Jay Satiro
Reviewed-by: Daniel Stenberg

Supersedes #5888
Closes #8595

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