OPNSense/core 1a55473src/www firewall_rules_edit.php firewall_rules.php

Filter, add ipv6-icmp type selection, closes https://github.com/opnsense/core/issues/3412
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+56-2src/www/firewall_rules_edit.php
+37-0src/www/firewall_rules.php
+93-22 files

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