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/kodiupdate.py

@@ -1,4 +1,3 @@
-# -*- coding: utf-8 -*-
 # This file is part of beets.
 # Copyright 2017, Pauli Kettunen.
 #
@@ -23,18 +22,16 @@ Put something like the following in your config.yaml to configure:
         user: user
         pwd: secret
 """
-from __future__ import division, absolute_import, print_function
 
 import requests
 from beets import config
 from beets.plugins import BeetsPlugin
-import six
 
 
 def update_kodi(host, port, user, password):
     """Sends request to the Kodi api to start a library refresh.
     """
-    url = "http://{0}:{1}/jsonrpc".format(host, port)
+    url = f"http://{host}:{port}/jsonrpc"
 
     """Content-Type: application/json is mandatory
     according to the kodi jsonrpc documentation"""
@@ -54,14 +51,14 @@ def update_kodi(host, port, user, password):
 
 class KodiUpdate(BeetsPlugin):
     def __init__(self):
-        super(KodiUpdate, self).__init__()
+        super().__init__()
 
         # Adding defaults.
         config['kodi'].add({
-            u'host': u'localhost',
-            u'port': 8080,
-            u'user': u'kodi',
-            u'pwd': u'kodi'})
+            'host': 'localhost',
+            'port': 8080,
+            'user': 'kodi',
+            'pwd': 'kodi'})
 
         config['kodi']['pwd'].redact = True
         self.register_listener('database_change', self.listen_for_db_change)
@@ -73,7 +70,7 @@ class KodiUpdate(BeetsPlugin):
     def update(self, lib):
         """When the client exists try to send refresh request to Kodi server.
         """
-        self._log.info(u'Requesting a Kodi library update...')
+        self._log.info('Requesting a Kodi library update...')
 
         # Try to send update request.
         try:
@@ -85,14 +82,14 @@ class KodiUpdate(BeetsPlugin):
             r.raise_for_status()
 
         except requests.exceptions.RequestException as e:
-            self._log.warning(u'Kodi update failed: {0}',
-                              six.text_type(e))
+            self._log.warning('Kodi update failed: {0}',
+                              str(e))
             return
 
         json = r.json()
         if json.get('result') != 'OK':
-            self._log.warning(u'Kodi update failed: JSON response was {0!r}',
+            self._log.warning('Kodi update failed: JSON response was {0!r}',
                               json)
             return
 
-        self._log.info(u'Kodi update triggered')
+        self._log.info('Kodi update triggered')