Almost all callers have string literal, and the length is known at
compile time.

The inverted check was introduced by commit 46d00dd8, and commit
8ad17d25 added a check for the wrong variable.  D'oh!

Closes https://github.com/MusicPlayerDaemon/MPD/issues/1303

Closes https://github.com/MusicPlayerDaemon/MPD/issues/1297

MPD supports only 8 channels, so MAX_CHANNELS is enough, the array
doens't need to be SPA_AUDIO_MAX_CHANNELS (which is 64).

Closes https://github.com/MusicPlayerDaemon/MPD/issues/1297

.. instead of DeferEvent, which is not thread-safe.  This caused
various playback problems, which was initially caused by the
DeferEvent/InjectEvent split in commit 774b4313

Closes https://github.com/MusicPlayerDaemon/MPD/issues/1298

Currently fails in class NfsFileReader due to
https://github.com/MusicPlayerDaemon/MPD/issues/1298

With libfmt versions older than 7, this leads to an endless recursion
between Error() and FmtError(), resulting in a crash due to stack
overflow.  D'oh!

Closes https://github.com/MusicPlayerDaemon/MPD/issues/1295

Should have been removed by commit a8087dc1

Closes https://github.com/MusicPlayerDaemon/MPD/issues/1294

This commit also increases the PROTOCOL_VERSION so clients can detect
the availability of the feature.

During the libfmt migration, I converted "%1.3f" to just "{:1.3}"
without the "f" suffix, but libfmt defaults to scientific notation,
which can break some MPD clients.

Closes https://github.com/MusicPlayerDaemon/MPD/issues/1291

Requires PipeWire 0.3.32.

Closes https://github.com/MusicPlayerDaemon/MPD/issues/1283

This bug caused a 9 second offset in all time stamps.  Due to that,
the Snapcast server thought the chunks are too old and discarded them.

Fixes https://github.com/MusicPlayerDaemon/MPD/discussions/1287