add mdns zeroconf announcer

docs/devnotes.md

@@ -48,6 +48,17 @@ hashwasm would solve the streaming issue but reduces hashing speed for sha512 (x
 * blake2 might be a better choice since xxh is non-cryptographic, but that gets ~15 MiB/s on slower androids
 
 
+## assumptions
+
+### mdns
+
+* outgoing replies will always fit in one packet
+* if a client mentions any of our services, assume it's not missing any
+* always answer with all services, even if the client only asked for a few
+* not-impl: probe tiebreaking (too complicated)
+* not-impl: unicast listen (assume avahi took it)
+
+
 # sfx repack
 
 reduce the size of an sfx by removing features

docs/lics.txt

@@ -6,17 +6,21 @@ L: MIT
 
 https://github.com/pallets/jinja/
 C: 2007 Pallets
-L: BSD 3-Clause 
+L: BSD 3-Clause
 
 https://github.com/pallets/markupsafe/
 C: 2010 Pallets
-L: BSD 3-Clause 
+L: BSD 3-Clause
+
+https://github.com/paulc/dnslib/
+C: 2010-2017 Paul Chakravarti
+L: BSD 2-Clause
 
 https://github.com/giampaolo/pyftpdlib/
-C: 2007 Giampaolo Rodola'
+C: 2007 Giampaolo Rodola
 L: MIT
 
-https://github.com/nayuki/QR-Code-generator
+https://github.com/nayuki/QR-Code-generator/
 C: Project Nayuki
 L: MIT