Mise à jour de librairie getid3 en 1.9.13

https://github.com/JamesHeinrich/getID3/releases/tag/v1.9.13

bugfix #89: ID3v2.4 custom genres with slashes
bugfix #88: large QuickTime files exceed PHP memory limit
bugfix #87: ID3v2 write GRID data not working properly
bugfix #86: Increase autoloading definitions
bugfix #84: ID3v2 available writable frames list
bugfix #82: ID3v2 datetime logic
bugfix #80: attempt to autodetect ID3v1 encoding
bugfix #77: add partial support of DSSv6
bugfix #76: add mysqli version of caching extension
bugfix #75: mysql cache max key length
bugfix #71: custom error handler to catch exif_read_data() errors
bugfix #71: add support for mb_convert_encoding
bugfix #70: ID3v2 POPM / UFID
bugfix #68: workaround broken iTunes ID3v2
bugfix #48: Quicktime set MIME to video/mp4 where applicable
bugfix #1930 fread on pipes
bugfix #1926 relax ID3v2.IsValidURL check