Use queue db table instead of in memory queue struct

src/db.h

@@ -507,6 +507,9 @@ db_files_get_album_count(void);
 int
 db_files_get_count_bymatch(char *path);
 
+int
+db_file_get_seekpos(uint32_t id);
+
 void
 db_files_update_songartistid(void);