GHA: silence proselint warnings and an error

Fix new issues found by `proselint`.

Also:
- silence this technical warning:
```
:0: DeprecationWarning: /home/runner/.p

GHA: silence proselint warnings and an error

Fix new issues found by `proselint`.

Also:
- silence this technical warning:
```
:0: DeprecationWarning: /home/runner/.proselintrc was found instead of a JSON file. Rename to /home/runner/.proselintrc.json.
```
- fix an input filename.
`proselints` fails now if an input file is missing.

Reported-by: Jay Satiro
Bug: https://github.com/curl/curl/pull/15291#issuecomment-2410505100
Closes #15293

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ech: spelling, whitespace, say `--ech` default config

Closes #15167

codespell: extend checks to more subdirs

- fix issues found.
- fix a few more found locally.

Closes #15072

doh: cleanups

Mostly cleanup on identifiers of DoH code.
Always use 'Curl_doh_cleanup()' for releasing resources.

More concise and telling names (ymmv):

* prefix all st

doh: cleanups

Mostly cleanup on identifiers of DoH code.
Always use 'Curl_doh_cleanup()' for releasing resources.

More concise and telling names (ymmv):

* prefix all static functions with 'doh_' for unity builds
* doh_encode -> doh_req_encode
* doh_decode -> doh_resp_decode
* struct dohdata -> struct doh_probes
* probe's 'serverdoh' -> 'resp_body'
* probe's 'dohbuffer' -> 'req_body'
* probe's 'headers' -> 'req_hds'
* 'dohprobe()' -> doh_run_probe()'
* 'DOH_PROBE_SLOTS' -> 'DOH_SLOT_COUNT'
* 'DOH_PROBE_SLOT_IPADDR_V4' -> 'DOH_SLOT_IPV4'
* 'DOH_PROBE_SLOT_IPADDR_V6' -> 'DOH_SLOT_IPV6'
* 'DOH_PROBE_SLOT_HTTPS' -> 'DOH_SLOT_HTTPS_RR'

Closes #14783

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tidy-up: adjust casing of project names

Mostly TLS/SSH project name.

Closes #14160

CI: add whitespace checker

Fix issues detected.

Also:

- One of the `.vc` files used LF EOLs, while the other didn't.
Make that one also use LF EOLs, as this is appare

CI: add whitespace checker

Fix issues detected.

Also:

- One of the `.vc` files used LF EOLs, while the other didn't.
Make that one also use LF EOLs, as this is apparently supported by
`nmake`.

- Drop `.dsw` and `.btn` types from `.gitattributes`.
The repository doesn't use them.

- Sync section order with the rest of files in
`tests/certs/EdelCurlRoot-ca.prm`.

- Indent/align `.prm` and `.pem` files.

- Delete dummy `[something]` section from `.prm` and `.pem` files.

Mental note:
MSVC `.sln` files seem to accept spaces for indentation and also support
LF line-endings. I cannot test this and I don't know what's more
convenient when updating them, so left them as-is, with specific
exclusions.

Closes #14031

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GHA: detect and warn for more English contractions

As we try to avoid them in curl documentation

Closes #13940

docs/ECH: typo/clarification

Closes #13727

tidy-up: whitespace [ci skip]

TLS: add support for ECH (Encrypted Client Hello)

An EXPERIMENTAL feature used with CURLOPT_ECH and --ech.

Closes #11922