Added <gchar *et_format_track_number(const gint)> to centralize track number formatting
Added setting for disc number formatting as well as <gchar
*et_format_disc_number(const gint)> for central formatting access
Extracted Ape Tag constant
Added support for "total number of discs"
as well as autonumbering of "disc" (using folders to determine to which
disc a file belongs; equivalent to "track autonumbering")