(ipsec) cleanup unused ciphers, add null cipher for testing purposes, fix some php warnings on empty arrays

(legacy) www: strip action attribute from forms where not needed, closes https://github.com/opnsense/core/issues/929

fix for https://github.com/opnsense/core/commit/619b089c1bd9772a7c8e3b9394ab5dc1252fb5b7#diff-09f3249b844b641d5564ae047d77e704

(IPS) add Add promisc mode / physical interface selection, closes https://github.com/opnsense/core/issues/935

* optionally collect lagg and vlan parents when the physical device isn't configured yet

(user manager) add datepicker + small html style issues, closes https://github.com/opnsense/core/issues/552

(network insight) add interface totals and some extra time selections, https://forum.opnsense.org/index.php?topic=2965

Suggested by: @adschellevis

Log widget has a problem with config section unhide.

This finally concludes work on #880, left on -devel for a while
longer to double-check with the requesters.