Feature request: optionally run a specified list of nodes

It should be possible to override the default launcher behavior, i.e. running all READY nodes in the configured workflows. The client may want to set a list of specific nodes that should be run (due to on-demand strategy or to prevent certain calculations). Background: in VRE Language package it makes sense to execute some nodes on demand and not execute the rest.

This can also be done with setting higher node priorities but this does not prevent the execution of other nodes after the prioritized nodes have been completed. This can also be achieved by pausing/defusing all the other nodes in the configured worlflows but it is more management overhead because the list of the "other" nodes has to be saved and later on these nodes might have to be resumed/reignited.