queue/playlist/command: move range

The move command now accepts a range for the first argument, in the same
form as other range commands, e.g. move 15:17 3.  The first song in the
range is placed at the destination position. Note that as with other
range commands, the range is inclusive on the left only; this example
would move only songs 15 and 16, not 17.

[mk: fixed signed/unsigned warnings; use G_MAXUINT instead of
UINT_MAX]

src/queue.h

@@ -291,6 +291,12 @@ queue_swap_order(struct queue *queue, unsigned order1, unsigned order2)
 void
 queue_move(struct queue *queue, unsigned from, unsigned to);
 
+/**
+ * Moves a range of songs to a new position.
+ */
+void
+queue_move_range(struct queue *queue, unsigned start, unsigned end, unsigned to);
+
 /**
  * Removes a song from the playlist.
  */