Merge branch 'netmask6' into nextHEADrouteros-7.21beta2-3nextmain

This branch is a follow-up on 9ceed0926a749c51ebc050d80cd33100ecdbcc5a
with clean solution. Read on for details...

The data type `ip6-prefix` used to hold what it was named for - an IPv6
prefix:

    [user@mikrotik] > :put 2001:db8::dead:beef/32
    2001:db8::/32

This changed with RouterOS 6.21beta2, which now allows that exact same
data type to hold something like "address with prefix length attached":

    [user@mikrotik] > :put 2001:db8::dead:beef/32
    2001:db8::dead:beef/32

My scripts (namely `fw-addr-lists`) relied on the old behaviour and broke.
The commit mentioned above was just a quick workaround, with rough edges,
and it could still fail.

Sadly RouterOS does not support bit shifting on IPv6 data types, so a
(completely) mathematical solution is out of scope.

This branch implements a new and better workaround, see the first commit
of branch (6ad6f9aa08d558ff2e8ff3010fe5daec3c600c4a) for details.

I opened a support ticket / feature request on this topic, let's see
what results it brings...

https://help.mikrotik.com/servicedesk/servicedesk/customer/portal/1/SUP-201881

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