* Added an option to the Simulator module to connect to remote Gazebo servers.
This is usefull when the Gazebo simulation is running on a different host than the PX4 instance.
For example, we are running instances of PX4 with a companion application in multiple Dockers, for swarming simulations, which then connect to a remote Gazebo server.
A "-t" input argument has been added and can be called from the rcS startup script as: simulator start -t "192.168.178.122" $simulator_tcp_port
* _tcp_remote_ipaddr defaults to nullptr. This way testing against nullptr it can be determined if localhost or remote host is desired by the user.
* Documented the option in usage().
Signed-off-by: Peter Blom <peterblom.mail@gmail.com>
