opencv headless update

Removed dependency to opencv-python package as it may case conflict with apps using PyQT5.
Dependency has been replaced by to opencv-python-headless.
Also, a few bugfix.

Bug fixes

Fixed bug for CPU only application.

Fixed bug when opening configuration files.

Code improvements

Patch release including several code improvements using pre-commit hooks (black and flake8).

Python3.7 support

Added support for python 3.7

Bug fix

Patch release to fix a few bugs.

Stable release

First stable release for the defect_detection package.

Contains the complete API ready for use.

Changelog:

• Several bux fixes
• New function to load a model through the API with invoking torch directly
• New method for AE_cls class that handles automatic device selection
• Improvement of instructions on README

Initial release

Initial release for defect_detection API.

This release is mainly for testing building, publication to PyPI and installation.