sv_get/set get deepcopy, Fixes in socket handling. debug_print is raw

```sv_set``` for non ```StringsSocket``` now behaves as one might expect, was wrong before... but doesn't use ```prop_name``` yet or fancy conversion.
Warning on setting input socket (but still does it), it has no effect.

Debug print node uses ```deepcopy=False``` which gives a real view of the datastructure, very useful for further work with turning ```deepcopy``` on in many nodes, now datatype was obscured by ```sv_deep_copy``` which made a list of all but the deepest level no matter what. Afraid to fix/change that because I think that will expose many problems.