release v0.22.7

Fixes -Wformat warnings.

Closes https://github.com/MusicPlayerDaemon/MPD/issues/1150

A few exceptions are needed for sources which include COM header
(directly or indirectly).

This fixes lots of shadow warnings, see
https://github.com/MusicPlayerDaemon/MPD/issues/1150

Include the most specific header documented by MSDN instead.

"%lu" is portable - it works with both POSIX and Microsoft flavors.

Fixes a part of https://github.com/MusicPlayerDaemon/MPD/issues/1150

Closes https://github.com/MusicPlayerDaemon/MPD/issues/1130

Remove lots of #ifdefs.

Allows using ranges, always.  This is required to fix
https://github.com/MusicPlayerDaemon/MPD/issues/1130 without adding
more runtime conditionals.

For querying tags, the real song URI should be used, because if the
(display) URI is different, requesting it will not produce a usable
response.  This is a theoretical problem because none of the existing
playlist plugins sets the real_uri.

This requires changing the URI comparison in playlist::TagModified().

Closes https://github.com/MusicPlayerDaemon/MPD/issues/1154

Closes https://github.com/MusicPlayerDaemon/MPD/issues/1156

With the default value CURLAUTH_ANY, libcurl needs to probe for
authentication methods first, and only the second request will have an
Authorization header.

Closes https://github.com/MusicPlayerDaemon/MPD/issues/1155

Since we migrated to readthedocs.io, we don't need this target
anymore.  And Meson 0.58.0 apparently has a change breaking this
target.

Closes https://github.com/MusicPlayerDaemon/MPD/issues/1161

refactors GenerateOggSerial into a generic GenerateSerial
utility, under the util lib.

libFLAC may be encoded without Ogg support. If Ogg support is disabled,
libFLAC will still export Ogg-related methods (like setting a serial
number), and throw a runtime error when initializing an Ogg stream.

GenerateOggSerial does not depend on libogg. Refactoring it into
a generic GenerateSerial prevents having to add build-time checks
for libogg within the FLAC encoder plugin.