rename MFProjecto to MFMehanicalProject
extract new MFProject, and make MFProcessorFactory implements the new MFProject
merge SimpleMFProject into MFProcessorFactory
rename MFProcessFactory to SimpMFProject
turn TimoshenkoStandardProject to a MFProject factory
modify PolygonTask2D to Model2DTask and let RectangleTask delegate Model2DTask instead of inherent