Adapting CSVDevEval to work with our current FileList Structure

This is a WIP, which means Work in Progress.

In this MR I structured the files from the proposed CSV interface to be the same as in the current FileList we have. Furthermore, the current .lst files can be used in the CSVDatasetDevEval with some of the bells and whistles the current LST files has (e.g usage of external annotations).

The goal is of the MR is to:

1. Be able to use the current file lists we have
2. Allow the extra functionalities we currently have with the CSVs.