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/beets/util/bluelet.py

@@ -1,5 +1,3 @@
-# -*- coding: utf-8 -*-
-
 """Extremely simple pure-Python implementation of coroutine-style
 asynchronous socket I/O. Inspired by, but inferior to, Eventlet.
 Bluelet can also be thought of as a less-terrible replacement for
@@ -7,9 +5,7 @@ asyncore.
 
 Bluelet: easy concurrency without all the messy parallelism.
 """
-from __future__ import division, absolute_import, print_function
 
-import six
 import socket
 import select
 import sys
@@ -22,7 +18,7 @@ import collections
 
 # Basic events used for thread scheduling.
 
-class Event(object):
+class Event:
     """Just a base class identifying Bluelet events. An event is an
     object yielded from a Bluelet thread coroutine to suspend operation
     and communicate with the scheduler.
@@ -201,7 +197,7 @@ class ThreadException(Exception):
         self.exc_info = exc_info
 
     def reraise(self):
-        six.reraise(self.exc_info[0], self.exc_info[1], self.exc_info[2])
+        raise self.exc_info[1].with_traceback(self.exc_info[2])
 
 
 SUSPENDED = Event()  # Special sentinel placeholder for suspended threads.
@@ -336,16 +332,20 @@ def run(root_coro):
                     break
 
             # Wait and fire.
-            event2coro = dict((v, k) for k, v in threads.items())
+            event2coro = {v: k for k, v in threads.items()}
             for event in _event_select(threads.values()):
                 # Run the IO operation, but catch socket errors.
                 try:
                     value = event.fire()
-                except socket.error as exc:
+                except OSError as exc:
                     if isinstance(exc.args, tuple) and \
                             exc.args[0] == errno.EPIPE:
                         # Broken pipe. Remote host disconnected.
                         pass
+                    elif isinstance(exc.args, tuple) and \
+                            exc.args[0] == errno.ECONNRESET:
+                        # Connection was reset by peer.
+                        pass
                     else:
                         traceback.print_exc()
                     # Abort the coroutine.
@@ -386,7 +386,7 @@ class SocketClosedError(Exception):
     pass
 
 
-class Listener(object):
+class Listener:
     """A socket wrapper object for listening sockets.
     """
     def __init__(self, host, port):
@@ -416,7 +416,7 @@ class Listener(object):
         self.sock.close()
 
 
-class Connection(object):
+class Connection:
     """A socket wrapper object for connected sockets.
     """
     def __init__(self, sock, addr):
@@ -541,7 +541,7 @@ def spawn(coro):
     and child coroutines run concurrently.
     """
     if not isinstance(coro, types.GeneratorType):
-        raise ValueError(u'%s is not a coroutine' % coro)
+        raise ValueError('%s is not a coroutine' % coro)
     return SpawnEvent(coro)
 
 
@@ -551,7 +551,7 @@ def call(coro):
     returns a value using end(), then this event returns that value.
     """
     if not isinstance(coro, types.GeneratorType):
-        raise ValueError(u'%s is not a coroutine' % coro)
+        raise ValueError('%s is not a coroutine' % coro)
     return DelegationEvent(coro)