ENH: Allow sub-foldering in target directories

Base/Geometry/Analytic/imstkCube.cpp

Base/Geometry/Analytic/imstkCube.h

Base/Geometry/Analytic/imstkPlane.cpp

Base/Geometry/Analytic/imstkPlane.h

Base/Geometry/Analytic/imstkSphere.cpp

Base/Geometry/Analytic/imstkSphere.h

Base/Geometry/Map/imstkGeometryMap.cpp

Base/Geometry/Map/imstkGeometryMap.h

Base/Geometry/Map/imstkIdentityMap.cpp

Base/Geometry/Map/imstkIdentityMap.h

Base/Geometry/Map/imstkIsometricMap.cpp

Base/Geometry/Map/imstkIsometricMap.h

Base/Geometry/Map/imstkTetraTriangleMap.cpp

Base/Geometry/Map/imstkTetraTriangleMap.h

Base/Geometry/Mesh/imstkHexahedralMesh.cpp

Base/Geometry/Mesh/imstkHexahedralMesh.h

Base/Geometry/Mesh/imstkMesh.cpp

Base/Geometry/Mesh/imstkMesh.h

Base/Geometry/Mesh/imstkSurfaceMesh.cpp

Base/Geometry/Mesh/imstkSurfaceMesh.h