Statement-dl

Fixes

- Fix flatex login
- Fix downloading unread flatex files skipping some files

Changes
- Now auto-accepts flatex' new cookie banner

Features
flatex: Added paging support - statement-dl will now download more than just the first 100 documents

Fixes
flatex: Fixed part of the files not being downloaded in unread-only mode

Features
- Added an option to keep the original filenames (`--keep-filenames`)

Changes
- Document type sub-directories are no longer lower-cased, they are just kept as-is

Bugfixes
- Fix relative paths not working for the destination directory
- Fix crash when just running `statement_dl` with no options
- Fix a crash when geckodriver path is not specified
- flatex: Some documents were not downloaded because they did not have a unique filename. The filenames now have an added ID that is unique for each document to prevent this

Features
- Automatic download of flatex documents using Firefox
- Sorts your files into sub-directories based on the type of document
- Select between downloading unread or all documents
- Select date range
- Skips already downloaded documents