Prepare to migrate away from GLib.  Currently, we're still using GLib
as a backend.

Reduce heap allocator overhead.

Use only ConfigData.hxx in plugin sources to reduce header
dependencies.

Replaces GLib's GError.

g_file_error_quark() is meant to be used with the GFileError enum
which does not correspond with errno, but must be converted with
g_file_error_from_errno().

At the same time, this removes g_strerror() use for
g_file_error_quark().

Make sure we get a UTF-8 encoded string.

Use _scan() instead, to have more control.

The new method pair() receives an arbitrary name/value pair.  Support
for this is being added to a few decoder plugins.

Pass a callback table to scan_file() and scan_stream(), instead of
returning a tag object.

Loop over all frames with a specific id, and import all of them - not
just the first one (index 0).

Add the flag "b" to fopen().  Windows compatibility.

If we define id3v1_encoding, then the tags are not added to the
database.

Allow RIFF/AIFF ID3 tags up to 4 MB (old limit was 256 kB).  This
might still be too small for some users, and when somebody complains,
we might do something more clever (like streaming the data into
libid3tag?).

After we've been hit by Large File Support problems several times in
the past week (which only occur on 32 bit platforms, which I don't
have), this is yet another attempt to fix the issue.

The ID3_FRAME_GENRE field is queried only in tag_id3_import_text().
Don't pass the tag type to import_id3_string().

Splitted tag_id3_import_frame() into two specialized functions:
tag_id3_import_text() and tag_id3_import_comment().  Use
id3_frame_field() instead of directly accessing id3_frame.fields.

Changed "int type" to "enum tag_type".  Converted "int is_id3v1" to
"bool".

Prefer C over CPP.

Renamed functions.

According to the ID3 2.4 documentation, "TOPE" is "Original
artist/performer", not "performer".  Removed "TOPE" support.  Instead,
map TPE3 ("Conductor/performer refinement") and TPE4 ("Interpreted,
remixed, or otherwise modified by") to "performer".

The tag_id3.c library supports both the documented "TSO2" tag, and the
inofficial TXXX/ALBUMARTISTSORT.

The Vorbis/FLAC decoder automatically supports the new tag, without
further change.

If the UFID frame's owner is "http://musicbrainz.org", assume its
value is the MusicBrainz track id.

This updates the copyright header to all be the same, which is
pretty much an update of where to mail request for a copy of the GPL
and the years of the MPD project. This also puts all committers under
'The Music Player Project' umbrella. These entries should go
individually in the AUTHORS file, for consistancy.

Added a small AIFF parser library, code copied from the RIFF parser
(big-endian integers).  Look for an "ID3" chunk, and let libid3tag
parse it.