Smarty3 LegacyRender css.php

[gigamaster]

Change register theme and stylesheet :

• register_modifier
• register_function

from

$smarty->register_modifier('theme', 'Legacy_modifier_css_theme');
$smarty->register_function('stylesheet', 'Legacy_function_stylesheet');

to

$this->registerPlugin('modifier', 'theme', 'Legacy_modifier_css_theme' );
$this->registerPlugin('function', 'stylesheet', 'Legacy_function_stylesheet' );