OPNSense/core 91caae3src/etc/inc filter.lib.inc, src/www system_advanced_firewall.php

add firewall advanced setting  pf_disable_force_gw, closes https://github.com/opnsense/core/issues/1801

(cherry picked from commit 65a55bb1aaabdfd13e6ecc460dc4507791816995)
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+27-23src/etc/inc/filter.lib.inc
+19-0src/www/system_advanced_firewall.php
+46-232 files

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