Mark Windows mail tests as conflicting

These tests are not (yet) supposed to be run in parallel.

Test standard mail and imap on Windows CI

We setup the currently latest version of hMailServer[1] as mail server,
and configure according to imap_include.inc. To not require further

Test standard mail and imap on Windows CI

We setup the currently latest version of hMailServer[1] as mail server,
and configure according to imap_include.inc. To not require further
configuration, we adapt mail_skipif.inc and mail_include.inc to match
that configuration. However, we also change the default domain to the
reserved `example.com`.

We also update the standard mail tests to use the `--EXTENSIONS--`
section (instead of skipping the tests if ext/imap is not available).

Finally, we fix bug80751.phpt to expect the configured To and Cc mail
addresses.

[1] <https://www.hmailserver.com/>

Closes GH-8357.

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Fix #80751: Comma in recipient name breaks email delivery

So far, `SendText()` simply separates potential email address lists at
any comma, disregarding that commas inside a quoted-strin

Fix #80751: Comma in recipient name breaks email delivery

So far, `SendText()` simply separates potential email address lists at
any comma, disregarding that commas inside a quoted-string do not
delimit addresses. We fix that by introducing an own variant of
`strtok_r()` which caters to quoted-strings.

We also make `FormatEmailAddress()` aware of quoted strings.

We do not cater to email address comments, and potentially other quirks
of RFC 5322 email addresses, but catering to quoted-strings is supposed
to solve almost all practical use cases.

Co-authored-by: Nikita Popov <nikita.ppv@gmail.com>

Closes GH-6735.

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