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/unidecode/x1d4.py

@@ -84,7 +84,7 @@ data = (
 'e',    # 0x52
 'f',    # 0x53
 'g',    # 0x54
-'',    # 0x55
+None,    # 0x55
 'i',    # 0x56
 'j',    # 0x57
 'k',    # 0x58
@@ -156,23 +156,23 @@ data = (
 'y',    # 0x9a
 'z',    # 0x9b
 'A',    # 0x9c
-'',    # 0x9d
+None,    # 0x9d
 'C',    # 0x9e
 'D',    # 0x9f
-'',    # 0xa0
-'',    # 0xa1
+None,    # 0xa0
+None,    # 0xa1
 'G',    # 0xa2
-'',    # 0xa3
-'',    # 0xa4
+None,    # 0xa3
+None,    # 0xa4
 'J',    # 0xa5
 'K',    # 0xa6
-'',    # 0xa7
-'',    # 0xa8
+None,    # 0xa7
+None,    # 0xa8
 'N',    # 0xa9
 'O',    # 0xaa
 'P',    # 0xab
 'Q',    # 0xac
-'',    # 0xad
+None,    # 0xad
 'S',    # 0xae
 'T',    # 0xaf
 'U',    # 0xb0
@@ -185,9 +185,9 @@ data = (
 'b',    # 0xb7
 'c',    # 0xb8
 'd',    # 0xb9
-'',    # 0xba
+None,    # 0xba
 'f',    # 0xbb
-'',    # 0xbc
+None,    # 0xbc
 'h',    # 0xbd
 'i',    # 0xbe
 'j',    # 0xbf
@@ -195,7 +195,7 @@ data = (
 'l',    # 0xc1
 'm',    # 0xc2
 'n',    # 0xc3
-'',    # 0xc4
+None,    # 0xc4
 'p',    # 0xc5
 'q',    # 0xc6
 'r',    # 0xc7