for example, return all active non virtual interfaces:

$interfaces = legacy_config_get_interfaces(array("virtual" => false, "enable" => true));

"reserved" names in interfaces leads to converting arrays to arrays in arrays, not easy to solve without the need to change a lot of the legacy code in same run.

whitespace cleanup

PR: https://forum.opnsense.org/index.php?topic=3092.0

PR: https://forum.opnsense.org/index.php?topic=3083.0

Plugins should be able to register new interfaces.
The basic idea is to materialize interface settings into the running config, so other services can utilize them in a uniform way.
Current hooks for legacy vpns, ipsec and openvpn should move into the same structure, which eliminates current static hooks.

The return content of the interface type itself needs to be further refined.

(trafficshaper) remove unused burst, in freebsd 10.2 it doesn't crash anymore, but doesn't appear to be very useful either. closes https://github.com/opnsense/core/issues/226

(interfaces.lib.inc) regression, parse "inet6 2001:470:xxx:xxx::2 --> 2001:470:xxx:xxx::1 prefixlen 128"

Nothing to gain from clustering too much.  The upside is that
we've got to clean up the settings for firewall, general and
misc considerably.

(firewall, nat) detect current configured address family, https://github.com/opnsense/core/issues/807