Update the client ID used for Microsoft accounts, to use the new
microsoft@gnome.org account.

depends on https://gitlab.gnome.org/Infrastructure/Infrastructure/-/issues/1382

Add a document which lists the various policies, terms of use and
rate limits that apply to providers hosted on remote servers.

Backport for GNOME 46

See merge request GNOME/gnome-online-accounts!190

There are couple spots in goasmtpauth.c where a NULL-pointer may
be passed to strlen().

These should probably be asserted, but to avoid the unlikely case
where this may be possible, just fallback to a 0-length instead.

Backports for GNOME 46

See merge request GNOME/gnome-online-accounts!195

Add support for Proof Key for Code Exchange (PKCE) as described by RFC
7636. The only supported method is 'S256' as suggested by the RFC. If an
OAuth2
provider supports this, it is enough to override get_use_pkce to make it
return
TRUE to enable PKCE.

Based on work done by Andrea Azzarone

Since Google supports and recommend PKCE/S265 code challenges for
OAuth 2.0 Desktop/Mobile clients, enable it for this provider.

See: https://developers.google.com/identity/protocols/oauth2/native-app#step1-code-verifier

Depends on !188

Finding documentation to confirm Microsoft's policies on the
`windows_live` provider is quite difficult, however with some
testing it seems to support PKCE/S256, so enable it along with
the other OAuth 2.0 providers.

See: https://learn.microsoft.com/en-us/azure/active-directory-b2c/authorization-code-flow

Depends on !188

The "DAV" header entry is a comma-separated list, and can therefore
be repeated several times. The check was failing on some servers, so
switch to `soup_message_headers_get_list()` to fix it.

In the case of scoped DAV providers, namely fastmail.com, we run into
problems if we try to detect features from the response header when
checking a URI that doesn't support file access.

Move the header detection after any special-cased providers, to ensure
we don't break the short path.

For WebDAV accounts that may specifically not have files access,
use the available endpoint for re-authentication while leaving
file access disabled.

Support a short-path for mailbox.org WebDAV services.

depends on !200

closes #314

Support a short-path for fastmail.com WebDAV services.

depends on !200 (merged)

closes #315

Fix a NULL-pointer dereference in the Kerberos provider,
introduced when the Fedora provider was partially merged in.

closes #318

Ensure we are watching the same secret collection that the
goa-oauth2-handler writes to, by looking it up by alias rather
than relying on the label.

Backports for GNOME 46

See merge request GNOME/gnome-online-accounts!205

The provider dialog is part of the client library, rather than
any application, and so requires `<glib/gi18n-lib.h>` instead of
`<glib/gi18n.h>` to avoid trying to pull in translations from a
linked application's gettext domain.

closes #320

Backports for GNOME 46

See merge request GNOME/gnome-online-accounts!209