For simplicity, the MPD core should not have to deal with packing.  It
is rarely used, and those plugins that need it should use the
pcm_export library instead.

Converts padded 24 bit samples to packed 24 bit samples.  Will replace
the packed S24 sample format, which is not used internally.

Improving oss_reopen() by using the very same value that was used
initially.

Let the caller configure the audio_format object.

Merge three functions into one and call get_bitformat() only once.

Delete the now-unused pcm_byteswap library, and optimize the
pcm_export_state object.

Should have been "==", not "!=".

For simplicity, pad the dCS samples to 32 bit.  Packed 24 bit samples
are rarely used.  This patch does not include a real code change,
because there is no user of DSD_OVER_USB yet.

Eliminate support for reverse endian samples from the MPD core.  This
moves a lot of complexity to the plugins that really need it (only
ALSA and CDIO currently).

Don't use audio_format.reverse_endian.

Don't use audio_format.reverse_endian.

Don't use audio_format.reverse_endian.

Halve the sample rate for *:dsdusb:*.

This format is unused since the DSDIFF decoder plugin now reverses the
bit order.

Allow to remove this complexity from the MPD core.

Instead of doing run-time initialisation, use a constant lookup table.

[mk: backwars compatibility and autoconf check]

Fixes endless loop when the last line of a text file was not
terminated (bug 3470).

Some compilers are very picky, but we really aren't interested in the
return value.

Requires UNIX domain socket connection.

To pass ack values around.

Make sure we get a UTF-8 encoded string.

Use ACK_ERROR_PERMISSION instead of ACK_ERROR_NO_EXIST.