gen: fix shutdown in orogen-generated components
gen: fix shutdown in orogen-generated components

The current deployments were shutting down directly in the signal
handler. As most of us know, this is a very bad idea as pthreads
are not async-signal-safe.

Establish a slightly more complex communication between main and the
handler to shut down the ORB from main()

doudou/modelkit-component,doudou/modelkit-component