Added i3 extractor and general dataconverter

[RasmusOrsoe]

No description provided.

[asogaard]

Hi @RasmusOrsoe,
Just FYI: As this is a somewhat large PR (+788 lines), in the interest of merging the code relatively quickly, I will try to limit me feedback to overall code structure and functionality, and hold off on other stuff (linting, docstrings, unit tests, etc.). I am happy to work on this after this PR is merged.

[asogaard]

Hi @RasmusOrsoe,
Thanks for adding all of this hard work to our common repo! 🥳 Brilliant to get the ball rolling like this, and I look forward to getting the first batch of material into main.

I have tried to proved some comments and suggestions for each of the four added files. Please let me know if anything is unclear, if you disagree with my suggestions, and if there is anything I can do to help out.

[RasmusOrsoe]

I have addressed the vast majority of issues and I vote that we for now live with the fact that the parallelized function in the i3dataconverter lives outside the class.

Also:

The code runs and works. :-)

[asogaard]

Hi @RasmusOrsoe,
Thanks for all of the comments and the code changes! I complete agree that we merge this PR and follow up on whatever remains through separate PRs/issues. Great job! 🥳