Switching branches and applying patches in the build repos will
unnecessarily touch many files, causing rebuilds of packages that didn't
really change; furthermore, it is filling the reflog with many entries.

Don't ever switch to base branch in the build repos and apply patches in
a temporary clone to avoid these issues.

In addition, GPG signing is generally disabled in the build repos to
override potential global configuration (as signing doesn't make sense and
will slow down rebases).

Fixes #845

The main advantage is that procd is capable of logging stderr to logd,
making errors easier to debug.

Fixes #328

Add Buffalo WZR-HP-G300NH2 to Makefile, device is already supported in OpenWrt and LEDE.
Verified functionality with actual device.

Fixes #658

Filter IGMP+MLD

Caused by a broken backport.

Fixes #689

Use the common term; the "Expert Mode" never was a distinct mode of
operation anyways.

Fixes autoupdater for Hotnet-UB and AP121. Also add note about broken
autoupdates on Tube2H.

The arguments are now provided by gluon-mesh-batman-adv-core, so
gluon-radvd can be used with other mesh protocols.

[Matthias Schiffer: removed PROVIDES dependency]

gluon-neighbour-info: improve verbosity on wrong cli parameters

Some drivers (mt76) don't support arbitrary MAC addresses. Use the
addresses provided by the driver (avoiding the primary address) by default,
but fall back to our has-based scheme when the driver doesn't provide
(enough) addresses.

Also switch to kmod-ath10k-ct, so we can drop our AP+IBSS patch.

Accidentially forgot to commit this. The sleep is necessary so netifd can
actually stop the WLAN interfaces after `wifi down`.

[Matthias Schiffer:
  - improve commit message
  - add pidof check
  - also call `wifi down`
]

Fixes #823