🐞Arrangement doesn't pass playlist items to Track properly

[demberto]

This issue might be related to #48. But unlike IterProp properties, Track instances are passed the playlist items they contain from their parent Arrangement.

1. Arrangement.tracks gathers items from the singular playlist event (there's only one such event per arrangement)

   PyFLP/pyflp/arrangement.py

   Lines 428 to 438 in f2bd7a0

   	if ArrangementID.Playlist in self._events:
   	pl_event = cast(PlaylistEvent, self._events[ArrangementID.Playlist][0])
   	for events in self._collect_events(TrackID):
   	items: list[_PlaylistItemStruct] = []
   	if pl_event is not None:
   	for item in pl_event.items:
   	idx = item["track_index"]
   	if max_idx - idx == count:
   	items.append(cast(_PlaylistItemStruct, item))
   	yield Track(*events, items=items)

2. Track receives it:

   PyFLP/pyflp/arrangement.py

   Lines 295 to 302 in f2bd7a0

   	class Track(MultiEventModel, Iterable[PlaylistItemBase], SupportsIndex):
   	"""Represents a track in an arrangement on which playlist items are arranged.
   	
   	"""
   	def __init__(self, *events: AnyEvent, **kw: Unpack[_TrackKW]):
   	super().__init__(*events, **kw)

   
   

   PyFLP/pyflp/arrangement.py

   Lines 280 to 281 in f2bd7a0

   	class _TrackKW(TypedDict):
   	items: list[_PlaylistItemStruct]

3. There goes Track.items:

   PyFLP/pyflp/arrangement.py

   Lines 352 to 353 in f2bd7a0

   	items = KWProp[List[PlaylistItemBase]]()
   	"""Playlist items present on the track."""