GHA: add shellcheck job and fix warnings, shell tidy-ups

Reviewed-by: Daniel Stenberg
Closes #13307

scripts/contri*sh: no longer grep -v ' '

Originally these scripts filtered out names that have no space so that
they better avoid nick names not intended for credits. Such names are

scripts/contri*sh: no longer grep -v ' '

Originally these scripts filtered out names that have no space so that
they better avoid nick names not intended for credits. Such names are
not too commonly used, plus we now give credit even to those.

Additionally: non-latin names, like Asian, don't have spaces at all so
they were also filtered out and had to be manually added which made it
an error-prone operation where Asian names eventually easily fell off by
mistake.

Closes #11206

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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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contributors.sh: actually use $CURLWWW instead of just setting it.

The script was all set up for flexibility where curl-www is elsewhere in
the filesystem, but then hard-coded ../curl-ww

contributors.sh: actually use $CURLWWW instead of just setting it.

The script was all set up for flexibility where curl-www is elsewhere in
the filesystem, but then hard-coded ../curl-www anyway...

Closes #10064

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scripts/contributors.sh: strip one OR MORE leading spaces

From names found credited in commit logs

scripts: use `grep -E` instead of `egrep`

egrep is deprecated

Closes #9491

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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scripts/contributors.sh: correct the copyright range

contributors: strip off final comma

The final row of contributors should not end with a comma as it's the
end of the list.

Closes: #8785
Reviewed-by: Daniel Stenberg <daniel

contributors: strip off final comma

The final row of contributors should not end with a comma as it's the
end of the list.

Closes: #8785
Reviewed-by: Daniel Stenberg <daniel@haxx.se>

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curl.se: new home

Closes #6172

scripts: improve the "get latest curl release tag" logic

... by insiting on it matching "^curl-".

contributors: Also include people who contributed to curl-www

Closes #4884

scripts: use last set tag if none given

Makes 'delta' and 'contributors.sh' easier to use.

Make the delta script invoke contrithanks to get current number of
contributors instea

scripts: use last set tag if none given

Makes 'delta' and 'contributors.sh' easier to use.

Make the delta script invoke contrithanks to get current number of
contributors instead of counting THANKS, for accuracy.

Closes #4881

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scripts/contributors: make committers get included too

in addition to authors

contributors.sh: use "on github", not at

scripts/contri*sh: use "git log --use-mailmap"

contri*.sh: cut off parentheses from names too

contributors.sh: better grep pattern, use grep -a

contributors: Show GitHub username if real name unknown

Prior to this change if a GitHub contributor's real name was unknown
they would be omitted from the list.

Bug: https://gi

contributors: Show GitHub username if real name unknown

Prior to this change if a GitHub contributor's real name was unknown
they would be omitted from the list.

Bug: https://github.com/curl/curl/issues/824

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contributors.sh: make --releasenotes implied

It got too annoying to type =)

contributors.sh: make 79 the max column width (from 80)

URLs: change all http:// URLs to https://

scripts: moved contributors.sh and contrithanks.sh into subdir