http: move headers collecting to writer

- add a client writer that does "push" response
headers written to the client if the headers api
is enabled
- remove special handling

http: move headers collecting to writer

- add a client writer that does "push" response
headers written to the client if the headers api
is enabled
- remove special handling in sendf.c
- needs to be installed very early on connection
setup to catch CONNECT response headers

Closes #12880

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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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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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headers api: remove EXPERIMENTAL tag

Closes #8900

headers.h: make Curl_headers_push() be CURLE_OK when not built

... to avoid errors when the function isn't there.

Reported-by: Marcel Raad
Fixes #8627
Closes #8628

lib: make the headers API depend on --enable-headers-api

header api: add curl_easy_header and curl_easy_nextheader

Add test 1940 to 1946 to verify.

Closes #8593