Refactored MemoryScriptTask to extract the core of the transformation in class MemoryScriptEngine and some common fetaures in class AbstractMemoryScriptTask.
Added a new Mult memory script runner workflow task.
It takes as inputs the PreesmScenario and a map of DAGs and associated MemoryExclusionGraphs and returns as output the map of DAGs and MemoryExclusionGraphs updated wrt. memory scripts.