New port: security/snuffleupagus

Snuffleupagus is a PHP7+ module designed to drastically raise the cost
of attacks against websites. This is achieved by killing entire bug
classes and providing a powerful virtual-patching system, allowing the
administrator to fix specific vulnerabilities without having to touch
the PHP code.

WWW: https://snuffleupagus.readthedocs.io/

PR: 224545
Submitted by: Franco Fichtner <franco@opnsense.org> (maintainer)
Approved by: rene (mentor)
Differential Revision: https://reviews.freebsd.org/D13606