Update vendored beets to 1.6.0

Updates colorama to 0.4.6
Adds confuse version 1.7.0
Updates jellyfish to 0.9.0
Adds mediafile 0.10.1
Updates munkres to 1.1.4
Updates musicbrainzngs to 0.7.1
Updates mutagen to 1.46.0
Updates pyyaml to 6.0
Updates unidecode to 1.3.6

libs/common/beetsplug/bpd/gstplayer.py

@@ -1,4 +1,3 @@
-# -*- coding: utf-8 -*-
 # This file is part of beets.
 # Copyright 2016, Adrian Sampson.
 #
@@ -17,15 +16,13 @@
 music player.
 """
 
-from __future__ import division, absolute_import, print_function
 
-import six
 import sys
 import time
-from six.moves import _thread
+import _thread
 import os
 import copy
-from six.moves import urllib
+import urllib
 from beets import ui
 
 import gi
@@ -40,7 +37,7 @@ class QueryError(Exception):
     pass
 
 
-class GstPlayer(object):
+class GstPlayer:
     """A music player abstracting GStreamer's Playbin element.
 
     Create a player object, then call run() to start a thread with a
@@ -64,7 +61,8 @@ class GstPlayer(object):
         """
 
         # Set up the Gstreamer player. From the pygst tutorial:
-        # http://pygstdocs.berlios.de/pygst-tutorial/playbin.html
+        # https://pygstdocs.berlios.de/pygst-tutorial/playbin.html (gone)
+        # https://brettviren.github.io/pygst-tutorial-org/pygst-tutorial.html
         ####
         # Updated to GStreamer 1.0 with:
         # https://wiki.ubuntu.com/Novacut/GStreamer1.0
@@ -109,7 +107,7 @@ class GstPlayer(object):
             # error
             self.player.set_state(Gst.State.NULL)
             err, debug = message.parse_error()
-            print(u"Error: {0}".format(err))
+            print(f"Error: {err}")
             self.playing = False
 
     def _set_volume(self, volume):
@@ -129,7 +127,7 @@ class GstPlayer(object):
         path.
         """
         self.player.set_state(Gst.State.NULL)
-        if isinstance(path, six.text_type):
+        if isinstance(path, str):
             path = path.encode('utf-8')
         uri = 'file://' + urllib.parse.quote(path)
         self.player.set_property("uri", uri)
@@ -177,12 +175,12 @@ class GstPlayer(object):
             posq = self.player.query_position(fmt)
             if not posq[0]:
                 raise QueryError("query_position failed")
-            pos = posq[1] // (10 ** 9)
+            pos = posq[1] / (10 ** 9)
 
             lengthq = self.player.query_duration(fmt)
             if not lengthq[0]:
                 raise QueryError("query_duration failed")
-            length = lengthq[1] // (10 ** 9)
+            length = lengthq[1] / (10 ** 9)
 
             self.cached_time = (pos, length)
             return (pos, length)
@@ -215,6 +213,59 @@ class GstPlayer(object):
         while self.playing:
             time.sleep(1)
 
+    def get_decoders(self):
+        return get_decoders()
+
+
+def get_decoders():
+    """Get supported audio decoders from GStreamer.
+    Returns a dict mapping decoder element names to the associated media types
+    and file extensions.
+    """
+    # We only care about audio decoder elements.
+    filt = (Gst.ELEMENT_FACTORY_TYPE_DEPAYLOADER |
+            Gst.ELEMENT_FACTORY_TYPE_DEMUXER |
+            Gst.ELEMENT_FACTORY_TYPE_PARSER |
+            Gst.ELEMENT_FACTORY_TYPE_DECODER |
+            Gst.ELEMENT_FACTORY_TYPE_MEDIA_AUDIO)
+
+    decoders = {}
+    mime_types = set()
+    for f in Gst.ElementFactory.list_get_elements(filt, Gst.Rank.NONE):
+        for pad in f.get_static_pad_templates():
+            if pad.direction == Gst.PadDirection.SINK:
+                caps = pad.static_caps.get()
+                mimes = set()
+                for i in range(caps.get_size()):
+                    struct = caps.get_structure(i)
+                    mime = struct.get_name()
+                    if mime == 'unknown/unknown':
+                        continue
+                    mimes.add(mime)
+                    mime_types.add(mime)
+                if mimes:
+                    decoders[f.get_name()] = (mimes, set())
+
+    # Check all the TypeFindFactory plugin features form the registry. If they
+    # are associated with an audio media type that we found above, get the list
+    # of corresponding file extensions.
+    mime_extensions = {mime: set() for mime in mime_types}
+    for feat in Gst.Registry.get().get_feature_list(Gst.TypeFindFactory):
+        caps = feat.get_caps()
+        if caps:
+            for i in range(caps.get_size()):
+                struct = caps.get_structure(i)
+                mime = struct.get_name()
+                if mime in mime_types:
+                    mime_extensions[mime].update(feat.get_extensions())
+
+    # Fill in the slot we left for file extensions.
+    for name, (mimes, exts) in decoders.items():
+        for mime in mimes:
+            exts.update(mime_extensions[mime])
+
+    return decoders
+
 
 def play_simple(paths):
     """Play the files in paths in a straightforward way, without