libsaria: Move list size function

It now exists with my new playlist code, since I'm phasing out the old
code.

libsaria/library/list.cpp

@@ -152,11 +152,4 @@ namespace libsaria
 			libsaria::audio::stop();
 	}
 
-	unsigned int library::size()
-	{
-		if (index::is_filtered() == true)
-			return index::size();
-		return play_list.size();
-	}
-
 }; /* Namespace: libsaria */

libsaria/library/list/list.cpp

@@ -1,5 +1,7 @@
 
 #include <libsaria/track.h>
+#include <libsaria/index.h>
+#include <libsaria/library.h>
 #include <libsaria/print.h>
 #include "list.h"
 
@@ -27,4 +29,11 @@ namespace libsaria
 		track_list.sort(compare_tracks);
 	}
 
+	unsigned int library::size()
+	{
+		if (index::is_filtered() == true)
+			return index::size();
+		return track_list.size();
+	}
+
 }