[tools] Added tcp_aircraft_server

re-broadcasts the ivy telemetry stream from a specified vehicle over tcp to
a specified remote ip. Committed on request and behalf of Antoine Drouin
(poine)
[Messages] Fixed caps etc for internal commonality as well as commonality
with messages_ng
[tools] tcp_aircraft_server: fix indentation, python3 compat
[tools] tcp_aircraft_server: read PAPARAZZI_HOME