conversion ctors

src/typed-geometry/detail/utility.hh

src/typed-geometry/types/objects/aabb.hh

src/typed-geometry/types/objects/box.hh

src/typed-geometry/types/objects/capsule.hh

src/typed-geometry/types/objects/cylinder.hh

src/typed-geometry/types/objects/halfspace.hh

src/typed-geometry/types/objects/hemisphere.hh

src/typed-geometry/types/objects/inf_cone.hh

src/typed-geometry/types/objects/inf_cylinder.hh

src/typed-geometry/types/objects/line.hh

src/typed-geometry/types/objects/plane.hh

src/typed-geometry/types/objects/pyramid.hh

src/typed-geometry/types/objects/quad.hh

src/typed-geometry/types/objects/ray.hh

src/typed-geometry/types/objects/segment.hh

src/typed-geometry/types/objects/sphere.hh

src/typed-geometry/types/objects/triangle.hh