fixes#11746
- the original fix[1] inadvertently moved the logo object down one level
- this commit moves it back up, and fixes the tests to reflect the
expected format
[1]: 3f5daa60c8
- in 3.13.2 the importer always throws the error "The "path" argument must be of type string. Received an instance of Object"
- this is due to a change in method signature that wasn't accounted for
- added a test to catch similar changes to this code in future
- move all test files from core/test to test/
- updated all imports and other references
- all code inside of core/ is then application code
- tests are correctly at the root level
- consistent with other repos/projects
Co-authored-by: Kevin Ansfield <kevin@lookingsideways.co.uk>
