This MR adds the following:
- Adding multiple track collections in TFRecords is now available. Closes #109 (closed)
- Adapting the reader/writer of TFRecords so the correct track collection, conditional info etc. is loaded.
- Adding possibility to train CADS with TFRecords.
- Adapting unit tests of the TFRecords reader/writer.
- Adding Integration tests for CADS with TFRecords, Umami Cond Att and Umami Cond Att with TFRecords. Related to #142 (closed).
- Fixing issues in the evaluation chain of Umami Cond Att. Closes #143 (closed)
- Update documentation of preprocessing config section