Wrap Song in a broader Playback state object with stuff like volume and repeat mode

src/mpd_now_playable/playback/queue.py

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+from dataclasses import dataclass
+
+
+@dataclass(slots=True)
+class Queue:
+	#: The zero-based index of the current song in MPD's queue.
+	current: int
+	#: The index of the next song to be played, taking into account random and
+	#: repeat playback settings.
+	next: int
+	#: The total length of MPD's queue - the last song in the queue will have
+	#: the index one less than this, since queue indices are zero-based.
+	length: int