HaroldMills/Vesper: v0.4.8rc0

Release Candidate 0 for Vesper 0.4.8.

This release:

• Adds two new NFC detectors, MPG Ranch Thrush Detector 1.0 and MPG Ranch Tseep Detector 1.0.

• Adds an optional detector score to clip album clip view labels. BirdVoxDetect and the new MPG Ranch detectors produce detector scores, but the Old Bird Redux detectors currently do not.

• Makes the Transfer Call Classifications command visible by default in the Vesper UI.

• Adds a classification argument to the Export Clips CSV File and Export Clip Audio Files commands, fixing issues 123 and 124.

• Uses Ruamel YAML instead of PyYaml, fixing issues 97 and 154.