Since freifunk-gluon/packages#250 mesh-vpn-peers
can be empty arrays if they're not connected
and the node is in a WireGuard site.

Fixes: 1cb0fc84 ("gluon-status-page: swap bandwidth limits (#2304)")
Resolves #2370

The network.wireless status ubus call only returns the configured
channel from UCI, breaking the status page in outdoor mode, where the
configuration contains 'auto' instead of a number.

Fixes: 0d3fa6b5 ("gluon-status-page: use ubus to get radio channels")
Closes #2336

In js `return` does behave like `continue` in a forEach() iteration.
The fixed function was intended to return nothing on error and does so
now, instead of a shorter (useless) array like before.

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

Fixes the display of client counts, which are numbers and not strings
in the respondd data.

Fixes: 3a885a1b ("gluon-status-page: make "gateway nexthop" a link (#2278)")

Do not depend on the respondd-airtime module just to get the configured
channels. This removes the display of the frequency in addition to the
channel, as it is not readily available.

In addition, the translation string is improved to allow for text after
the channel number.

This code is usually running on an embedded CPU without FPU. In
addtition to its inefficience, the algorithm is also much harder to
understand.

Replace the logarithm formula with a simple loop.

With this commit, the gateway nexthop is now a clickable link, that leads
to the status page of the nexthop.

It was found that a one second timeout for nodeinfo data may be too low,
so that when a node is otherwise occupied that timeout may be reached
too often.

The nodeinfo query response is also vital to the status-page base
template, so that when it times out, the site will be turned in a broken
state, that it cannot recover from.

Fixes: #2256

overflow for 'DejaVu Sans'.

This renames the local_client zone to loc_client, as local_clint exceeds
the maximum zone length allowed for firewall3, which is 11 bytes.

This worked previously due to firewall3 using unsafe string operations.
Now creation of the chain fails (latest OpenWrt master).

This adds the wireless client count for 2.4GHz and 5 GHz radios to the
status page. Previously, only the total client count advertised by
the mesh protocol was visible.

This reverts commits
- caf2dd03.
- 07ebac6a
- 55eff45f

I accidentally pushed these commits as I had them lying around on a
dirty checkout I did testing on.