scripts/delta: output bugfixes/day

tidy-up: OS names

Use these words and casing more consistently across text, comments and
one curl tool output:
AIX, ALPN, ANSI, BSD, Cygwin, Darwin, FreeBSD, GitHub, HP-UX, Linux,

tidy-up: OS names

Use these words and casing more consistently across text, comments and
one curl tool output:
AIX, ALPN, ANSI, BSD, Cygwin, Darwin, FreeBSD, GitHub, HP-UX, Linux,
macOS, MS-DOS, MSYS, MinGW, NTLM, POSIX, Solaris, UNIX, Unix, Unicode,
WINE, WebDAV, Win32, winbind, WinIDN, Windows, Windows CE, Winsock.

Mostly OS names and a few more.

Also a couple of other minor text fixups.

Closes #14360

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misc: remove duplicate words

Closes #11740

scripts/delta: fix "ambiguous argument" when used in branches

scripts/delta: show percent of number of files changed since last tag

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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scripts/delta: adapt to curl.h changes for the opt counter

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/delta: check the file delta for current branch

... also polish the output style a little bit

scripts/delta: hide a git error message we don't care about

fatal: path 'src/tool_listhelp.c' exists on disk, but not in [tag]

scripts/delta: count command line options in the new file

... which makes the shown delta number wrong until next release.

scripts: invoke interpreters through /usr/bin/env

Closes #7602

scripts/delta: also show total number of days

curl.se: new home

Closes #6172

scripts/delta: add diffstat summary

... and make output more table-like

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

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

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/delta: adapt to new public header layout

scripts: fix typos

delta: use --diff-filter on the git diff-tree invokes

Suggested-by: Dave Reisner

scripts/delta: show repo delta info from last release

... where "last release" should be the git tag in the repo.