WebSockets: make support official (non-experimental)

Inverts the configure/cmake options to instead provide options that
disable WebSockets and have them (ws + wss) enabled by default.

WebSockets: make support official (non-experimental)

Inverts the configure/cmake options to instead provide options that
disable WebSockets and have them (ws + wss) enabled by default.

Closes #14936

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tidy-up: spelling WebSockets

Closes #14646

cmake: add Linux CI job, fix pytest with cmake

- extend existing Linux workflow with CMake support.
Including running pytest the first time with CMake.

- cmake: generate `test

cmake: add Linux CI job, fix pytest with cmake

- extend existing Linux workflow with CMake support.
Including running pytest the first time with CMake.

- cmake: generate `tests/config` and `tests/http/config.ini`.
Required for pytest tests.
Uses basic detection logic. Feel free to take it from here.
Also dump config files in a CI step for debugging purposes.

- cmake: build `tests/http/clients` programs.

- fix portability issues with `tests/http/clients` programs.
Some of them use `getopt()`, which is not supported by MSVC.
Fix the rest to compile in CI (old-mingw-w64, MSVC, Windows).

- GHA/linux: add CMake job matching an existing autotools one.

- GHA/linux: test `-DCURL_LIBCURL_VERSIONED_SYMBOLS=ON`
in the new CMake job.

- reorder testdeps to build server, client tests first and then
libtests and units, to catch errors in the more complex/unique
sources earlier.

- sort list in `tests/http/clients/Makefile.inc`.

Closes #14382

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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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ws: fix spelling mistakes in examples and tests

Closes #11784

ws: make the curl_ws_meta() return pointer a const

The returned info is read-only for the user.

Closes #11261

tests/http: make curl_setup.h the first include

This is required for the macros there to take effect for system
libraries. Specifically, including the system libraries first led to
w

tests/http: make curl_setup.h the first include

This is required for the macros there to take effect for system
libraries. Specifically, including the system libraries first led to
warnings about `_FILE_OFFSET_BITS` being redefined in curl_config.h on
the Solaris autobuilds for ws-data.c and ws-pingpong.c.
Also make the curl includes come first for the other source files here
for consistency.

Closes https://github.com/curl/curl/pull/11046

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tests/http: fix out-of-tree builds

Add both lib/ directories (src & build) to the search path so
curl_setup.h and its dependencies can be found.

Followup-to acd82c8b

Re

tests/http: fix out-of-tree builds

Add both lib/ directories (src & build) to the search path so
curl_setup.h and its dependencies can be found.

Followup-to acd82c8b

Ref: #11006
Closes #11036

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tests/http: more tests with specific clients

- Makefile support for building test specific clients in tests/http/clients
- auto-make of clients when invoking pytest
- added test_09_0

tests/http: more tests with specific clients

- Makefile support for building test specific clients in tests/http/clients
- auto-make of clients when invoking pytest
- added test_09_02 for server PUSH_PROMISEs using clients/h2-serverpush
- added test_02_21 for lib based downloads and pausing/unpausing transfers

curl url parser:
- added internal method `curl_url_set_authority()` for setting the
authority part of a url (used for PUSH_PROMISE)

http2:
- made logging of PUSH_PROMISE handling nicer

Placing python test requirements in requirements.txt files
- separate files to base test suite and http tests since use
and module lists differ
- using the files in the gh workflows

websocket test cases, fixes for we and bufq
- bufq: account for spare chunks in space calculation
- bufq: reset chunks that are skipped empty
- ws: correctly encode frames with 126 bytes payload
- ws: update frame meta information on first call of collect
callback that fills user buffer
- test client ws-data: some test/reporting improvements

Closes #11006

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