Release 1.3.0

New Release 1.3.0 (new features)

This PR addresses release 1.3.0, it includes several bug fixes, code cleaning, documentation, and new functionality.

New Features

• Enhanced Performance features in the same fashion as the note features. Use:
  partitura.musicanalysis.make_performance_features(score, performance, alignment, feature_functions);
• Fixed-size option for Note features. Use:
  partitura.musicanalysis.make_note_features(score, force_fixed_size=True)
• Create a score from a note array functionality. Call:
  partitura.musicanalysis.note_array_to_score(note_array);

New Optional Features

• If music21 is installed : Import music21 to Partitura by calling partitura.load_music21(m21_score)
• If MidiTok is installed : Export Partitura Score to Tokens by calling partitura.utils.music.tokenize(score_data, tokenizer)

Bug Fixes

• Fixed bug: #264
• Fixed bug: #251
• Fixed bug: #207
• Fixed bug: #162
• Fixed bug: #261
• Fixed bug: #262
• Fixed Issue: #256
• Fixed bug: #133
• Fixed bug: #257
• Fixed bug: #248
• Fixed bug: #223

Other Changes

• Minor Changes to the Documentation
• Addition of Docs link to the GitHub header
• Upgraded Python version requirements to Python>= 3.7