[jsk_network_tools] Add C++ implementation of silverhammer_highspeed_receiver.

[garaemon]

Only core is implemented in c++.

It cooperates with python thin wrapper and bridged via ros between them.

• python is too slow to implement receiver in one process
  • Giant lock does not allow us to write parallel processes
• python multiprocessing may generate zombie process
  • Because python signal/exception mechanism is not robust with multiprocessing and socket programming
• Implement UDP server in C++ to write receiving packets and collecting packets in different thread for performance reason.
• But C++ is not good at Meta Object Protocol, so C++ UDP server just sends not-deserialized ROS buffer to python wrapper via normal ROS topic protocol and convert it into serialized ROS message in python, because we'd like to specify different classes from ros parameters.

[garaemon]

merged because jenkins docker hangs up