Section2D → Toolbox Relation

File in Section/Section2D	Includes file in Toolbox
Circle2D.cpp	IntegrationPlan.h
CircularHollow2D.cpp	IntegrationPlan.h
HSection2D.cpp	IntegrationPlan.h
ISection2D.cpp	IntegrationPlan.h
Rectangle2D.cpp	IntegrationPlan.h
Section2D.h	ResourceHolder.h