Make TransformationChain clonable/copyable

[Makman2]

TransformationChain is for now not copyable since it works with unique pointers that prohibit that. But the base problem is that we store pointers/references to unknown Transformation types (we only know they have the base type CE3D::Transformation::Transformation).

For now the copy constructor should be deactivated. But you should be able to copy your TransformationChain. So there is just one possibility to enable such a behaviour (or two depending how you want actually implement it):

• Override each object/class/whatever from our CE3D::Object that contains Clone(). Clone() returns a copy of the object.
• Maybe a bit better: Define an IClonable interface with one member function: also Clone(). Classes that need this feature can then just implement it (multiple inheritance is allowed).

I would favor variant 2, easy to handle and keeps performance where it needs to be.

This would address all components that store base classes.

[Makman2]

Interestingly the tests work if you don't copy anything (so you invoke the old copy constructor with an empty TransformationChain). Nice testing flaw...