strparse: string parsing helper functions

Designed to aid converting off from sscanf parsers. sscanf is hard to
use right, easy to mess up and often makes for sloppy error checking.

strparse: string parsing helper functions

Designed to aid converting off from sscanf parsers. sscanf is hard to
use right, easy to mess up and often makes for sloppy error checking.

The new parsers allow more exact and pedandic parsing.

This new set of functions should be possible to use (and extend) and
switch over other libcurl parser code to use going forward.

Adapts the following to use the new functions:

- altsvc.c
- hsts.c
- http_aws_sigv4.c

Bonus: fewer memory copies, fewer stack buffers.

Test: Unit test1664

Docs: docs/internals/STRPARSE.md

Closes #15692

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tests: use %LOGDIR to refer to the log directory

This will allow it be set dynamically.

Ref: #10818

tests: use %TESTNUMBER instead of fixed number

This makes the tests easier to copy and relocate to other test numbers
without having to update content.

Closes #6738

curl.se: new home

Closes #6172

tests: Automatically deduce the tool name from the test case for unit tests

It is still possible to override the executable to run during the test,
using the <tool> tag, but this patch r

tests: Automatically deduce the tool name from the test case for unit tests

It is still possible to override the executable to run during the test,
using the <tool> tag, but this patch removes the requirement that the
tag must be present for unit tests.

It also removes the possibility of human error when existing test cases
are used as the basis for new tests, as recently witnessed in 81c37124.

Reviewed-by: Daniel Stenberg
Closes #4976

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altsvc: accept quoted ma and persist values

As mandated by the spec. Test 1654 is extended to verify.

Closes #4443

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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tests: Fixed XML validation errors in some test files.

alt-svc: the libcurl bits