Updates to setup files

- Include additional non-python files in MANIFEST.in (package_data in
  setup.cfg was not including the files)
- Update requirements in setup.cfg

MANIFEST.in

@@ -1,3 +1,6 @@
 recursive-include core *.h
 recursive-include core *.m
-include run.py
+include run.py
+graft locale
+graft help
+graft qtlib/locale

setup.cfg

@@ -31,12 +31,15 @@ python_requires = >=3.6
 install_requires = 
     Send2Trash>=1.3.0
     polib>=1.1.0
-    hsaudiotag3k>=1.1.3*
+    mutagen>=1.45.1
     distro>=1.5.0
     PyQt5 >=5.14.1,<6.0; sys_platform != 'linux'
     pywin32>=228; sys_platform == 'win32'
+setup_requires =
+    sphinx>=3.0.0
 tests_require = 
     pytest >=6,<7
+include_package_data = true
 
 [options.entry_points]
 console_scripts =