[protector] fix warning error

Using deprecated API: use $config->get('$key.$a') instead
[protector] HTML Purifier version 4.6.0
[protector] support HTML Purifier >= 4.4.0
[protector] htmlpurify set mb_substitute_character
[protector] fix typo (filter:htmlpurify)
[lib] HTML Purifier up to 4.6.0
Merge branch 'htmlpurifier4.6' into pilot
Merge branch 'protector_htmlpurifier4.6' into pilot
[CorePack] version pilot:8f4cb58