In audb 1.7.0 we added support to publish not only audio and video files, but every file format a user would like to publish.
This means we should also adjust process_index(), process_file(), process_files(), process_folder() to support other files.

The question is how to best support text files:

• Should we pre-define a list of file extension(s), that are then treated as text files?
• Should we check the mime-type of a file, to see how to handle it (might slow things down)?
• Should we use try and except statements (could be tricky as audio files might also fail for audiofile if ffmpeg is not installed)

And how to return the content of a text file:

• Should it be a text string?
• Should it be a JSON string?

/cc @maxschmitt