Add Piwik\Intl\Idn and TLD domain provider #12689
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Clean port of LGPL libidn2 punycode decoder.
Intended to be a starting point for #11640 (URL's with IDN shows in Punycode).
Unlike the punycode decoder in libs/Zend/Validate/Hostname.php, this decoder:
xn--e1afmkfd.xn--p1ai
(see INTL_IDNA_VARIANT_UTS46)Might eventually allow removal of libs/Zend/Validate (if someone writes an email address validator). The code point validator in Zend_Validate_Hostname is dubious given the preg_match buffer limit.