new score attributes in match export, new score properties, misc fixes

[huispaty]

• match export:
  • added new scoreprop_line for tempo_indication score meta information using optional param 'tempo_indication'
  • added missing grace score note attribute
  • added new score attribute voice_overlap for deletion-score notes that have a voice-overlapping (aligned) score note
  • added new score attribute diff_score_version for score notes that reflect a special score version
• score, musicxml import: new score attributes capturing score meta information: work_title, work_number, title_number , movement_number
• midi import: minor fix for note IDs (numbering starting from 1 instead of 0)
• midi export: new optional merge_tracks_save param
• test_match_import.py: minor fix for default midiClockUnits rate, updated mozart_k265_var1.match file

[manoskary]

Are any of the proposed fixes related to existing issues?

[manoskary]

This PR introduces a lot of useful features and fixes from midi merging tracks, to matchfile edits, to score new attributes. I wasn't aware of about discussion of these changes so I would also request a review from another person. Also matchiline changes should probably be reviewed by somebody else than me. This review addresses mostrly styling, minor comments and questions.

[codecov-commenter]

Codecov Report

Patch coverage: 63.09% and project coverage change: -0.38% ⚠️

Comparison is base (36450da) 85.36% compared to head (4d73f13) 84.98%.
Report is 27 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #303      +/-   ##
===========================================
- Coverage    85.36%   84.98%   -0.38%     
===========================================
  Files           79       80       +1     
  Lines        13590    13739     +149     
===========================================
+ Hits         11601    11676      +75     
- Misses        1989     2063      +74     

Files Changed	Coverage Δ
partitura/directions.py	78.49% <ø> (ø)
partitura/io/matchlines_v1.py	82.38% <ø> (ø)
tests/__init__.py	100.00% <ø> (ø)
tests/test_tonal_tension.py	100.00% <ø> (ø)
partitura/io/matchfile_utils.py	92.87% <28.00%> (-4.59%)	⬇️
partitura/io/importmidi.py	83.94% <50.00%> (ø)
partitura/io/exportmatch.py	78.30% <64.70%> (-4.84%)	⬇️
partitura/io/exportmidi.py	90.54% <66.66%> (-0.37%)	⬇️
tests/test_pianoroll.py	99.45% <66.66%> (-0.55%)	⬇️
partitura/io/importmusicxml.py	79.97% <80.00%> (+0.39%)	⬆️
... and 3 more

... and 8 files with indirect coverage changes

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[huispaty]

The PR is not linked to any reported issues but addresses changes/change requests originating from discussions with @neosatrapahereje (match export) and @sildater (score attributes).