Feature/window splitting try2

[jspaezp]

Since there were so many changes this is pretty much a "as a reference" PR ... we need to cherry pick what changes are actually compatible and move them forward onto the new base.

[sander-willems-bruker]

As of this point I'll not push to develop straight away anymore and maintain my own develop branch for easy of collaboration. Apologies if I got your PR in a "messy" state due to the merge conflicts. Most of the conflicts should be easily resolved though, as most of them should be the result of error propagation more than anything else. If I didn't crush your motivation, feel free to make the PR with merge conflicts, I will handle resolve them locally before final merging into dev.

[jspaezp]

Checklist (I take ideas on how to/how should be handled):

1. Remove debug prints
2. Add unit tests (should be easy to re-use the current files...)
3. Handle edges (Right now for instance if the scan window is 150 scans and the step-span is 100-100, it will only yield a single scan from 0-100, and thus drop the last 50)

[jspaezp]

I am not 100% happy with the extent of the tests but i think it can be "good enough" for some purposes.... at least good enough to review.

[sander-willems-bruker]

Merged it into my branch which is ready to go into develop: #23