Add iptables rule to add miniupnd rules to forward chain.

Fixes #10043.
sendEmail: New addon

Fixes #10242
Avahi: New package. Can be used as mdns-responder for airplay.

Libdaemon: New package. Needed for avahi.
Nginx: New package. Version 1.3.11.
Avahi: Added backup.
Bugfixes: Various bugfixes in all three packages.
Avahi: Changes on rootfile.
Nginx: fixes for rootfile.
Avahi: Fixed lfs file.
Avahi: Fixes in Rootfile.

Nginx: Fixes in Rootfile.
Nginx: Bug fixes in lfs file.
Nginx: Bugfixed rootfile.
New add-on: check_mk_agent 1.2.0p3

https://bugzilla.ipfire.org/show_bug.cgi?id=10275

Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>
Merge branch 'master' into next
Merge remote-tracking branch 'origin/core66' into next
Merge remote-tracking branch 'trikolon/next' into next
Fix rootfiles of libdaemon and avahi.
Add nginx, avahi and libdaemon to make.sh.
Merge branch 'next' of ssh://git.ipfire.org/pub/git/ipfire-2.x into next
Nginx: Minor Bugfixes.