[Don't merge] fix #289898: dynamic changes do not playback for tremolos

[jthistle]

Resolves: https://musescore.org/en/node/289898

This fix works by always rendering single-note dynamics events, even when an instrument doesn't have single-note dynamics enabled. Then, when collecting a note, a reference to the list of CC velocity events is passed to it. Each note event for that note then searches for the correct velocity from the list if it exists and uses it in playNote.

This leads to two arrays for events:

tempPlayEvents - the SND velocity events that will actually be rendered

tempAllVelEvents - all the SND velocity events, regardless of whether they'll be rendered or not

[Jojo-Schmitz]

rebase needed

[jthistle]

Superseded by #5264