Construct non-app-framework output
Trying to create / run unit tests for (eventually) subplant, and it crashes on writing output in a non-app environment.
In plcgen
I have a org.eclipse.escet.cif.plcgen.WarnOutput
class for forwarding warnings and this seem to do the job. This issue aims to create infra structure for enabling such a change for all output streams (debug, normal, warn, and error output).
Addresses #472