Add ordering to social_icons shortcode

[danimalweb]

We need a way to custom order the icons whenever we call the shortcode.

Maybe passing in the keys in an array for the order would work.

[danimalweb]

@BrandonH676 This will be available in the next version of Tofino. The order will be as per the platform order passed into the shortcode.

echo do_shortcode('[social_icons platforms="soundcloud,twitter,facebook,pinterest"]');