🐞 `Arrangement` parsing logic is incorrect

[demberto]

1. Pattern timemarkers get added to the first arrangement's events.

2. Last arrangement isn't yielded by Arrangements.__iter__ at all.

   PyFLP/pyflp/arrangement.py

   Lines 444 to 463 in ceff918

   	def __iter__(self) -> Iterator[Arrangement]:
   	first = True
   	events: list[AnyEvent] = []
   	def make_arr():
   	return Arrangement(*events, version=self._kw["version"])
   	for event in self._events_tuple:
   	if event.id == ArrangementID.New:
   	if not first:
   	yield make_arr()
   	events = []
   	first = not first
   	elif event.id == ArrangementsID.Current:
   	return make_arr() # last arrangement
   	for enum_ in (ArrangementID, TimeMarkerID, TrackID):
   	if event.id in enum_:
   	events.append(event)
   	break