Fix reading of Oxford Instruments binary .ebsp files of version 4

[hakonanes]

Description of the change

This fix ensures Oxford Instruments' binary .ebsp files of version 4 can be read by skipping an extra byte (uint8) after the file version. When accounting for this extra byte, patterns are read correctly as before. This fixes #591.

Thanks to @drowenhorst-nrl for this insight.

I don't know what this extra byte is, but it is 0 (when read as uint8) in the file I have access to.

Progress of the PR

• [x] Docstrings for all functions
• [x] Unit tests with pytest for all lines
• [x] Clean code style by running black via pre-commit

For reviewers

• [ ] The PR title is short, concise, and will make sense 1 year later.
• [ ] New functions are imported in corresponding __init__.py.
• [ ] New features, API changes, and deprecations are mentioned in the unreleased section in CHANGELOG.rst.
• [ ] New contributors are added to release.py, .zenodo.json and .all-contributorsrc with the table regenerated.