.transform(ed) implementation for Geometry Base class

[mattiskoh]

Is there a reason this is not yet implemented? Will it ever be?
https://github.com/compas-dev/compas/blob/961fdf8/src/compas/geometry/geometry.py#L82

[tomvanmele]

Geometry is a(n) (abstract) base class. what transform does depends on the type of geometry and therefore on the implementing class. only reason Geometry is not actually defined as abstract is because of IronPython. ABC create memory leaks in IPy...