WSM-7 #modify admin/install.mysql.utf8.sql to add 3 tables: com_wsmusic_artist, com_wsmusic_track, com_wsmusic_playlist

WSM-7 #modify admin/install.mysql.utf8.sql to add 3 tables : 
com_wsmusic_artist: singer 's name
com_wsmusic_track: music and music video
com_wsmusic_playlist: all kind of playlist, album, user's playlist, user's favorite