reworking structure, most everything is broken.
Fresh start, moving previous iteration to _old
Refactor

- Unified Casefile interface
- Removed configuration knowledge from modules
- Added default config
- Refactored filecabinets into loaders.py
- Added basic tests

TODO:
- More tests!
- Some cleanup
Removed "old" folders
Minor cleanup.
Update, bumped version.

- Minor cleanup
- Removed TODO.md
- Added util to report version number