[MusicXML] support the new TPC1/TPC2 construct
See #25462: Audit all import filters for the new TPC1/TPC2 construct.
Issues actually caused by TPC1/TPC2:
- invalid TPC1 for all MusicMXL imported notes (sometimes resulting in MuseScore aborts)
- incorrect pitch on import for some notes in case of transposing instruments
- incorrect octave on export for some notes in case of transposing instruments
Comments
Fixed with pull request #1063 (commit 0c03f2e).
Automatically closed -- issue fixed for 2 weeks with no activity.