pfSense

VTI input validation. Fixes #8674

Add input validation to prevent switching away from VTI or deleting a
VTI P1/P2 which belongs to an assigned interface, since this would break
the interface assignment and cause an interface mismatch at the next
boot.

Remove unneeded VTIs in IPsec sync. Issue #8674

Still needs input validation to prevent changes that would remove an
assigned interface.

Fix PHP error when adding a gateway from interfaces.php. Fixes #8680

Fix PHP7 error due to lack of int casting for gateway weight when making rules.

Fix PHP7 array issue in array_merge_recursive_unique()

Teach DynDNS to use custom IP check services. Fixes #8664

Fixes #8661 PHP7 illegal string offset

PHP7 fixed illegal argument supplied foreach()

Revert "Add fields for DNS server hostnames for TLS verification. Implements #8602"

Per https://www.nlnetlabs.nl/bugs-script/show_bug.cgi?id=658 the verification
requires OpenSSL 1.1.x, and FreeBSD 11.2 base OpenSSL is 1.0.x.

This reverts commit ad08a8242ca45907e0486712d218a5f8f34c7332.

Fixed #8654
Fixed PHP7 issue causing separators not to work at all