Export to .dez format [FEATURE]

[johentsch]

Describe the solution you'd like ms3 transform command should have an option to export expanded harmony tables to the JSON format .dez of Algomus' Dezrann app. In addition, the converter should be a standalone script.

Concrete ToDos (Optional)

• [x] Write a first draft (667c2a1 summarizing work by LC & JH)
• [x] #49
• [x] correctly treat first and second endings (#50)
• [x] correctly treat anacrusis (see K283.1 for example)
• [x] separate localkey segments (#50)
• [x] separate phrases (#50)
• [x] extract cadences (#50)
• [x] #48
• [x] add parameters for choosing which feature goes into which line (three above, three below) (#50)
• [ ] ~add a test case for a set of labels issued elsewhere, e.g. .rntxt converted to a DataFrame~ (not planned)
• [ ] simply the script according to the fact that quarterbeats_all_endings are now included with all facets by default (v2.2.0)