This removes PKG_VERSION and PKG_RELEASE from most Makefiles, as the
value was never useful for Gluon packages; instead, PKG_VERSION is set
to 1 in gluon.mk.

It also removes two other weird definitions:

- gluon-iptables-clamp-mss-to-pmtu replicating the old PKG_VERSION logic
  from gluon-core, but without the fixed PKG_BUILD_DIR to prevent
  unnessary rebuilds
- gluon-hoodselector set GLUON_VERSION=3

- Move site check for prefix4 and extra_prefixes6 to gluon-core, so the
  rules don't need to be duplicated in several packages. This also fixes
  gluon-respondd not checking extra_prefixes6 at all when
  gluon-ebtables-source-filter is not installed as well.
- A redundant check for prefix6 is removed from gluon-l3roamd (this was
  already checked by gluon-core)
- A separate check for prefix4 remains in gluon-client-bridge, as the
  setting in mandatory there

Reorder scripts so that the mesh_lan interface is accounted for.

Two other firewall upgrade scripts (mesh-babel and l3roamd) are
reordered as well. While there seems to be no hard dependency at the
moment, it makes sense to run the basic setup first, also to avoid
problems with future changes.

Closes: #2090
Fixes: ed094bc6 ("gluon-core: firewall: Allow custom gluon_wired interfaces (#2041)")

* add check_site.lua to validate required field from site
* make use of node_client_prefix6 if defined in site

uc is used in the initscript. It must be set as dependency

This patch makes use of the new feature in l3roamd to gracefully
add, remove and list the mesh interfaces that are currently in use. This
helps when changing mesh interfaces often - a characteristic of the
wireguard protocol implementation as in the previous behavior all local
clients are dropped when adjusting mesh interfaces.

The local_node ifstatus must be checked for local-node, not client. While
we're at it, also clean up the syntax a bit.

gluon-core, gluon-l3roamd: introduce script gluon-list-mesh-interfaces that lists all currently active mesh interfaces

* use local socket
* use main routing table,
* pass client-bridge

 * gluon-core, gluon-client-bridge: introduce new firewall zone: local_client
 * gluon-core: put clients in local_client zone, introduce drop-zone,
   set dns-rules and zones
 * gluon-respondd: allow respondd on mesh
 * gluon-status-page-api: allow http input on mesh and client

Some files have received some additional refactoring.

gluon-mesh-babel is not merged yet, and once it is, this would lead to a
circular dependency.