Eencijfer

Added
- Added duckdb export-format
- Added CLI options for source_dir and result_dir

Fix
- Added gracefull exit when no eencijfer-file is found
- Fixed broken import

Add
- Added working-dir for intermediate saves

Update
- Updated some column-definitions that, according to documentation should be objects, instead of int.

Update

- Added possibility to export to csv or excel.

Update

- Downgrade numpy-version so it might work on pyodide.

Fixed

- Code errors.