Support for OttFlix videos in H5P

[eduardokraus]

This feature adds compatibility with the OttFlix platform within H5P, allowing educators and content creators to use videos hosted on OttFlix directly in their interactive activities.

[otacke]

Disclaimer: I am not part of H5P Group, so feel free to conpletely ignore my suggestions (which are based on a quick glance only anyway and not exhaustive).

1. You should ensure that your code adheres to the H5P Coding styleguide, e. g. indentation, positioning of else, use of == instead using ===, ...
2. While old H5P code uses ES5, newly written code should use ES6.
3. Are you sure this works without also modifying the list of providers in the AV widget?
4. H5P Group needs to test this, so you should supply information on how they can get hold of an OttFlix instance to do so.
5. You might want to check if this works properly for both, standalone videos and videos used in InteractiveVideo. This has caused issued here and there for other video handlers before.