fix #28336: Sending 'program change' message to JACK MIDI Out
Proper implementation of stopNotes() and initInstruments() for the calls from UI and RT threads
fix #31471: system text edits not linked
fix #31496: lyrics not propagated to existing parts
fix #31301: misaligned half notes
update & add vtests
Simple key signature detection algorithm
fix #31711: chord symbols & mmrests
fix #31436: segno et al do not display in mmrest
Merge pull request #1251 from trig-ger/midi_key

Simple key signature detection algorithm for MIDI import
Merge pull request #1239 from MarcSabatella/31471-system-text-link

fix #31471: system text edits not linked
Merge pull request #1254 from MarcSabatella/31301-half-alignment

fix #31301: alignment of half notes
Merge pull request #1268 from MarcSabatella/31711-chord-mmrest

fix #31711: chord symbols & mmrests
Merge pull request #1145 from Igevorse/jack-transport

fix #28336: Sending 'program change' message to JACK MIDI Out
Merge pull request #1269 from MarcSabatella/31436-segno-mmrest

fix #31436: segno et al do not display in mmrest