alfred: add new package

alfred: add new package

alfred is a user space daemon for distributing arbitrary local
information (e.g. hostnames or vis data) over a batman-adv mesh
network in a decentralized fashion via IPv6 link-local multicast.

Moved from the openwrt/routing feed, as discussed in
https://github.com/openwrt/routing/issues/184.

The one deviation from the feed copy is SUBMENU:=Wireless, which the
feed copy does not set at all: without it the package sits ungrouped at
the top of the Network menu. Wireless keeps it next to mesh11sd and
batctl, which move across with the same value. A dedicated Mesh submenu
is the better home for all three and is worth adding once enough of the
mesh packages have landed to justify it.

Signed-off-by: Josef Schlehofer <redacted>
Co-authored-by: Claude Fable 5 <redacted>