Removed some unused files
Moved UDTService related classes into subfolder
Server sends a single ICMP echo
Extracted UDTClient from Server
Separated udpserver.cpp into more files
Split some files, renamed socket.h to util.h
Proxy client sends ICMP TTL exceeded messages
Added note
Receive icmp ttl exceeded messages on proxy server
Forgot to add file
Server attempts to UDT connect to accepted client