Have similar information about config file in both mpd.1 ans mpd.conf.5

Update description with content from user manual [0].
Remove obsolete information regarding "required parameters" and log_level

[0] https://www.musicpd.org/doc/html/user.html#the-configuration-file

Closes https://github.com/MusicPlayerDaemon/MPD/issues/1001

release v0.22.3

Pass a std::string to PathTraitsUTF8::Relative(), implicitly casting
it to std::string_view.  This selects the right overload which returns
std::string_view instead of `const char *`; the latter could return
`nullptr` which would cause the implicit conversion of the return
value to std::string_view to crash.

Regression caused by commits ead20898 and a98d627c.

Closes https://github.com/MusicPlayerDaemon/MPD/issues/995

Found with modernize-avoid-bind
Signed-off-by: Rosen Penev <rosenp@gmail.com>

This is the same as GetMimeTypeBase(), which has already been applied.

No need to copy it to a buffer.

This adds support for input samples other than 16 bit to the FFmpeg
filter plugin.

If no conversion is necessary, return the child Filter as-is.  This
allows removing all nullptr checks from AutoConvertFilter.

If the FFmpeg filter outputs planar data, interleave it, just like the
FFmpeg decoder plugin does.

To be reused by the FFmpeg filter plugin.

This compatibility macro has been removed from FFmpeg long ago.

filter_chain_parse() passes a temporary string pointer which results
in a use-after-free in the PreparedChainFilter::Child::Open() error
message.