Add basic support for MUSICBRAINZ_WORKID tag

src/tag/Id3MusicBrainz.cxx

@@ -30,5 +30,6 @@ const struct tag_table musicbrainz_txxx_tags[] = {
 	{ "MusicBrainz Track Id", TAG_MUSICBRAINZ_TRACKID },
 	{ "MusicBrainz Release Track Id",
 	  TAG_MUSICBRAINZ_RELEASETRACKID },
+	{ "MusicBrainz Work Id", TAG_MUSICBRAINZ_WORKID },
 	{ nullptr, TAG_NUM_OF_ITEM_TYPES }
 };

src/tag/Names.c

@@ -44,4 +44,5 @@ const char *const tag_item_names[TAG_NUM_OF_ITEM_TYPES] = {
 	[TAG_MUSICBRAINZ_ALBUMARTISTID] = "MUSICBRAINZ_ALBUMARTISTID",
 	[TAG_MUSICBRAINZ_TRACKID] = "MUSICBRAINZ_TRACKID",
 	[TAG_MUSICBRAINZ_RELEASETRACKID] = "MUSICBRAINZ_RELEASETRACKID",
+	[TAG_MUSICBRAINZ_WORKID] = "MUSICBRAINZ_WORKID",
 };

src/tag/Type.h

@@ -57,6 +57,7 @@ enum TagType
 	TAG_MUSICBRAINZ_ALBUMARTISTID,
 	TAG_MUSICBRAINZ_TRACKID,
 	TAG_MUSICBRAINZ_RELEASETRACKID,
+	TAG_MUSICBRAINZ_WORKID,
 
 	TAG_NUM_OF_ITEM_TYPES
 };