Imports rearrangements, readme reformat, basic stuff.

Smoke tests are 100/100.

ebook_converter/utils/config_base.py

@@ -3,6 +3,7 @@ import collections
 import copy
 import datetime
 import functools
+import importlib.resources
 import json
 import numbers
 import os
@@ -10,8 +11,6 @@ import pickle
 import re
 import traceback
 
-from importlib.resources import files as _resource_files
-
 from ebook_converter.constants_old import config_dir
 from ebook_converter.constants_old import filesystem_encoding
 from ebook_converter.constants_old import preferred_encoding
@@ -591,7 +590,8 @@ def exec_tweaks(path):
 
 
 def default_tweaks_raw():
-    return str(_resource_files('ebook_converter').joinpath('data/default_tweaks.py'))
+    return str(importlib.resources.files('ebook_converter') /
+               'data/default_tweaks.py')
 
 
 def read_tweaks():

ebook_converter/utils/localization.py

@@ -1,5 +1,5 @@
+import importlib.resources
 import json
-from importlib.resources import files
 
 
 def get_lang():
@@ -39,9 +39,8 @@ def _load_iso639():
     # excerpt form Calibre transform code which is executed during Calibre
     # build).
     if _iso639 is None:
-        src = str(files('ebook_converter').joinpath('data/iso_639-3.json'))
-
-        with open(src, 'rb') as f:
+        with open(importlib.resources.files('ebook_converter') /
+                  'data/iso_639-3.json', 'rb') as f:
             root = json.load(f)
 
         entries = root['639-3']