Add a ProjectLauncher#getCommand for easier extension #6471
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Currently if one wants to extend a Project launcher it is required to completely reimplement the launch() method even if one only wants to add some argument to the commandline. Also things like returncode handling and reporting of results need to be implemented again.
This now adds a new method
ProjectLauncher#getCommand()that externalize the process of creating a commandline, this also allows to access the final commandline from the outside (e.g. to show it to the user) or further customize it.