Add two sections to the VIP.RestrictedFunctions sniff.

[jrfnl]

Using ini_set() for alternating PHP settings, as well as other functions with ability to change configuration at runtime of your scripts, such as error_reporting(), is prohibited on the WordPress.com VIP platform. Allowed error reporting in production can lead to Full Path Disclosure.

See https://vip.wordpress.com/documentation/code-review-what-we-look-for/#settings-alteration

I've added the most obvious PHP functions which would relate to this. Careful review of the functions listed needed & appreciated.

Fixes #460

[JDGrimes]

Looks good to me.

[jrfnl]

Thanks ;-)