Also improve a couple of imports and added support for the
old visit_ names. Priority will have the old visit_ names, such
as visit_discard over visit_expr, visit_callfunc over visit_call
etc.
We moved pyreverse.inspector.Project, pyreverse.inspector.project_from_files
and pyreverse.inspector.interfaces. These were moved since they didn't belong in astroid
and they can be better maintained inside pyreverse itself.
This patch calls visit_<node_type> whenever a frame doesn't have a `locals_type`
attribute, most likely because it wasn't yet visited. Closes issue #543.