operator method outputResultsJSON now returns the completion times together with the start times (schedule)

configuration of output QueueStatistics- and StationUtilization- graph has been updated, new gadget to be used

new plugin introduced to the sequence of pre-processing plugins. Updates the WIP of the stations based on the spreadsheet data provided by the user

temporary implementation of the plugin the preprocess the wip in the default instance. To  be added as full plugin

modules modified to addapt to the newly introduced method to store results within the one all-inclusive-file

runOneScenario method introduced to default Execution plugin. run method invoke this one and populates a result_list of the all-in-one-file

configuration file updated. plugis are defined by the module they reside in and their class. Simulation excecution plugin (run) is defined seperatelly