refactor midi_to_object() to allow setting of ticks_per_beat

[CrumpLab]

midi_to_object() could be refactored to allow setting of ticks_per_beat.

Suggestion to use pyramidi::MidiFramer$new()

#Initialize new pyramidi object
new_pyramidi_object <- pyramidi::MidiFramer$new()
# update ticks per beat
new_pyramidi_object$ticks_per_beat <- 96L

Then, import a midi file into the MidiFramer object. This should allow the ticks_per_beat to be set, and updated across the internal elements.

[CrumpLab]

pyramidi::MidiFramer$new("file.mid") can be used to import .mid files too, but it will fail when the .mid file does not have tempo.