Applied the following changes to various testcase classes:
- Namespaced with component[\level2-API]
- Moved to level2-API subdirectory when required.
- Fixed incorrect use statements with leading backslash.
- Remove file phpdoc block
- Remove MOODLE_INTERNAL if not needed.
- Changed code to point to global scope when needed.
- Fix some relative paths and comments here and there.
- All them passing individually.
- Complete runs passing too.
Special mention to:
- Some fixtures, initially defined in the test files have been
moved to new files in fixtures subdirectory, leaving the unit
test files clearer:
- moodle2_course_format_test.php
- Rename wrong named test:
- baseoptiogroup_test = baseoptigroup_test
