eina_value: break usage, but makes it more uniform and correct.

eina_value: break usage, but makes it more uniform and correct.

I did a bad decision to steal memory for Array, List, Hash and Struct
types, it was nice to not have to copy it internally, but breaks when
one needs to set a new value that was set elsewhere. What did not
happen with string, integers and other basic types.

This was exposed by Raphael Kubo using eina_model_property_set() with
complex types (Array, List and Hash) and it was not possible to
correctly set such properties.

Now it's all set, but the behavior changed and the memory is not
stolen and released anymore. Test eina_test_value.c was changed to
reflect it.

SVN revision: 67843