Allow to start run-apps parallel to other apps #59
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Enable to run simple apps (which use the run tag and don't have any plugins) parallel to other apps.
I am using this to add interrupt/resume buttons to the web interface (knorth55/jsk_robot#260), which can be activated during another task.
This could also be potentially useful for running battery checks, light on/off, and other kinds of quick scripts during demo execution.
The implementation still has some limitations: the parallel apps cannot be stopped by the web interface and as mentioned above cannot have any plugins or launch files. However, it should be a practical start towards a parallel web interface.
Currently under testing with the real robot. Will try to add more unit tests later too.
@knorth55