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.

Fixed to be accurate when converting from us to ms

Change us to ms for gateway alarm.

Fixes #8477 looking to be more consitent changed to use ms for gateway alarm.
Thanks to Luke Hamburg for helping with this and the code idea.
Keeping it as 0.xxxms for under 1 millisecond responses.
Just to stay ms as much as possible.

Correct string missing quotes. Fixes #8681

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

Fixed #8679

Fixed #8678

ELiminate 8 char restriction on "legacy" password
Fix spelling error

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