llist: remove direct struct accesses, use only functions

- Turned them all into functions to also do asserts etc.

- The llist related structs got all their fields renamed in order t

llist: remove direct struct accesses, use only functions

- Turned them all into functions to also do asserts etc.

- The llist related structs got all their fields renamed in order to make
sure no existing code remains using direct access.

- Each list node struct now points back to the list it "lives in", so
Curl_node_remove() no longer needs the list pointer.

- Rename the node struct and some of the access functions.

- Added lots of ASSERTs to verify API being used correctly

- Fix some cases of API misuse

Add docs/LLIST.md documenting the internal linked list API.

Closes #14485

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lib: tidy up types and casts

Cherry-picked from #13489
Closes #13862

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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curl.se: new home

Closes #6172

alt-svc: enable by default

Remove CURLALTSVC_IMMEDIATELY, which was never implemented/supported.

alt-svc support in curl is no longer considered experimental

Closes #5868

altsvc: clone setting in curl_easy_duphandle

The cache content is not duplicated, like other caches, but the setting
and specified file name are.

Test 1908 is extended to verify

altsvc: clone setting in curl_easy_duphandle

The cache content is not duplicated, like other caches, but the setting
and specified file name are.

Test 1908 is extended to verify this somewhat. Since the duplicated
handle gets the same file name, the test unfortunately overwrites the
same file twice (with different contents) which makes it hard to check
automatically.

Closes #5923

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llist: make it "struct Curl_llist"

As internal global names should use captical C.

Closes #5906

altsvc: remove the num field from the altsvc struct

It was superfluous since we have the list.size alredy

Reported-by: Jay Satiro
Fixes #5553
Closes #5563

altsvc: make saving the cache an atomic operation

... by writing the file to temp name then rename to the final when done.

Assisted-by: Jay Satiro
Fixes #4936
Closes #4942

alt-svc: add protocol version selection masking

So that users can mask in/out specific HTTP versions when Alt-Svc is
used.

- Removed "h2c" and updated test case accordingly

alt-svc: add protocol version selection masking

So that users can mask in/out specific HTTP versions when Alt-Svc is
used.

- Removed "h2c" and updated test case accordingly
- Changed how the altsvc struct is laid out
- Added ifdefs to make the unittest run even in a quiche-tree

Closes #4201

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alt-svc: the libcurl bits