Add API documentation
Support 64 bit offsets
Use InputStream for all reads

Preparing the protocol spec for multi-player support.

The first step to multi-player support.  Not much, just a dummy
command.

Implement the second part of https://bugs.musicpd.org/view.php?id=3990

These days, this is common knowledge, and doesn't need a lengthy
explanation.

The "tagtypes" command now has several sub commands which can be used
to edit that mask.

A complete list which replaces the incomplete list in the mpd.conf
manpage.

Requiring this prefix makes the client's intention very clear, but it
was too hard to understand why this prefix was needed.  Initially, my
intention was to differentiate from broken clients which prefix relate
URIs with a slash; once MPD allowed that.  In the past few years
however, MPD has disallowed that, and there was no significant
breakage (except for the "add /" special case which some clients
apparently still do).  So I figure it's about time to define that an
URI that begins with a slash points to an arbitrary file on the file
system.

Mapped to "=" in the MPD protocol.  This is the first operator,
initially supporting value matches in the MPD protocol.

A priority should be a volatile thing: it should schedule a song for
playing back once, but it should not affect the next time the queue
gets played.

Fix incorrect description of the "songs" field and add missing
"albums" field.
Signed-off-by: Joachim Fasting <joachifm@fastmail.fm>

Manipulates the playback range of a queued song.

Lists files and directories.  Supports storage plugins.