(filter) move bogons, without breaking application logic, for https://github.com/opnsense/core/issues/1331

PR: https://forum.opnsense.org/index.php?topic=4227.0

PR: https://forum.opnsense.org/index.php?topic=4152.0

There could be another error in here with the reported IPv6 issues...

PR: https://github.com/opnsense/core/issues/1331

(mvc) still delivering twice, funny thing is nobody probably noticed because delivered zip files (from CP) are unpacked normally

i386 is less storage-intense, but a reasonable amount of
free storage space is recommended in any case.

(dhcpd/unbound) don't try to handle empty section, closes https://github.com/opnsense/core/issues/1320

Optimized dhcp_clean_leases()

This is a pretty good option for anybody with a lack of a viable
local mirror, sparked by talks of a South-East Asia region mirror.