v4.4 release

Changes in this release:

• Add RFC8335 extended echo types to ICMP and ICMPv6 (#426)

• Handle loops in DNS name decompression (#444)

• Fix Windows' interface macro colliding with uses of that identifier in the code (#458)

• Sending IPv6 packets to a link-scope destination address now uses the right interface index (#448)

• Fix incorrect endian being used for ICMP's gateway and address_mask (#437)

• Socket in PacketSender::open_l3_socket is now closed if setsockopt fails (#433)

• Fix various incorrect doxygen documentation comments (#439).

• Fix infinite loop when querying the routing table in *BSD (#427)