exoirt Launcher
concatenating strings and int doesn't work

so we have to stringify the int first
only remove server from glib once
testing with timeout
write to both stderr and stdout

for testing (seems like neither arrives as Launcher)
eXternal RTSP-server -- python component

starts/stops an external RTSP-server and returns the correct URI
print stdout/stderr before and after shutdown
added counter for interaction
launch eXternal RTSP-server