Part 2 of 3. Continues PR GH-7689, changeset ee5ef30.
Edit and add tests for 18 modules, help_about to replace and run.
(cherry picked from commit ea3dc8029a)
Co-authored-by: Terry Jan Reedy <tjreedy@udel.edu>
This follows the previous patch that changed idlelib file names.
Class names that matched old module names are not changed.
Change idlelib imports in turtledemo.__main__.
Exception: config-extensions.def. Previously, extension section
names, file names, and class names had to match. Changing section
names would create cross-version conflicts in config-extensions.cfg
(user customizations). Instead map old names to new file names
at point of import in editor.EditorWindow.load_extension.
Patch extensively tested with test_idle, idle_test.htest.py, a custom
import-all test, running IDLE in a console to catch messages,
and testing each menu item. Based on a patch by Al Sweigart.
Miss Islington (bot)
Terry Jan Reedy