Export Mode -> Expert Mode

15 is the default in batman-adv-legacy, the new default 30 in newer batman-adv
versions is too high in larger networks.

fixes #365

This adds mesh_on_lan functionality.

A new optional site.conf option, mesh_on_lan, has been added. If set to
'true', all LAN ports will be used for meshing instead of being part of
the client bridge.

This will introduce a new nodeinfo object, network.mesh.bat0.interfaces,
containing any of the the following subordinated objects:

- wireless
- tunnel
- other

Each of these objects contains a (possibly empty) list of MAC addresses
(lowercase, colon-notation) corresponding to a interface of the given
class. Combined with a batman graph it is thus possible to mark
sub-graphs as "wireless" or "vpn".

The previously used object mesh_intefaces is superseded by this new
object structure and mesh_interfaces will be removed in a future Gluon
release.

Directly using libiwinfo is more reliable.

It would be nice to generalize this to work with multiple radios, maybe by
integrating it into the wifi-config module...

Fixes #219

This new package allows enabling or disabling the null method for the
fastd mesh VPN.

This new class allows visually pleasing lists of radio buttons/checkboxes/etc.
with long explanation texts.

All other titles are grey, the magenta-colored section titles inbetween look
weird.

This allows to reach the node in setup mode over the same link-local IPv6
address as br-client uses during normal operation.

OpenWrt doesn't set the regdom unless a WLAN device is started. Explicitly set
the regdom in the setup mode to get the correct list of allowed txpower entries
in the planned LuCI module.

This seems to mitigate weird bridge forwarding issues.

This will require site.mk to explicitly pull in the gluon-setup-mode and
gluon-config-mode-core packages.

This also adds an extended query protocol and deflate compression.