STUD-1707

STUD-1754

FOR-108

Included adding a general create_toy_course and create_sample_course method for tests

LMS-11090

This reverts commit 079808ee.

This reverts commit 252038c3, reversing
changes made to 7caf8c53.

Added update_item, create_item, create_child to split_draft.py

Cleaned up TODOs in test_mixed_modulestore.py

Unit test for auto-publish

LMS-11017

Added tests to test_mixed_modulestore.py for has_changes and added black_list to _auto_publish

Moved DIRECT_ONLY_CATEGORIES to draft_and_publish.py

Deleted test_split_draft_modulestore.py

Added _auto_publish to create course

Publish cleanups for update_version, source_version

Changed has_changes to use source_version

Removing mixed test that no longer makes sense in auto_publish world

Addressed TODOs in test_branch_setting

Python code can commonly contain characters that are invalid XML, such
as '<' and '>'. This has proven to be a pain point for instructors
implementing custom Python grading functions for their JSInput problems
(see sample code below).

This change creates a more robust template from which to make
modifications.

```python
    # This is an XML syntax error, when not inside a CDATA section.
    if i < 0:
        print('negative')
```