Fixes for PHP7.2

[shirosaki]

PHP 7.2 環境で出たerror, warningなどの修正を行いました。

• __construct for class
• use static function for call_user_func_array
• call inval to convert string to int
• use utf-8 encoding for php source
• Fix strong tag

[nao-pon]

@shirosaki Thank you for your contributes! 👍 About constructor, It should be support to old style parent::CLASS NAME() for old modules.

for example in XoopsPageNav ...

public function XoopsPageNav($total_items, $items_perpage, $current_start, $start_name="start", $extra_arg="")
{
    return self::__construct($total_items, $items_perpage, $current_start, $start_name, $extra_arg);
}

public function __construct($total_items, $items_perpage, $current_start, $start_name="start", $extra_arg="")

[shirosaki]

Thanks for review. Added old style constructor for html/class/* and html/kernel/*.

[nao-pon]

@shirosaki Thanks! but it seems missing keyword self::.

[shirosaki]

Sorry. Updated to add self:: and added some constructor fixes for modules.

[nao-pon]

@shirosaki Thanks! 👍