FeatureRequest: use __str__ of type instead of type in run/import-time registration of object

for artists, and rhino objects...
In order to make it more possible to use the current version of **unload_modules()** when working with a collection of modules and scripts (such as when one is developing plugin). since the equivalency of class/types will be gone for the same classes (even if no changes were made to the underlying classes) after invoking unload_modules().