Packaging Phase 1

 - Restructured for better packaging.
 - Added more metadata to packaging
 - Can now be run from command line via `python -m rstevaluation`
 or directy via `rstevaluation` if Python was added to `$PATH$`.

Legacy/README.md

+# Legacy code
+
+This folder contains legacy code that is not under active development anymore
+but can be helpful to use for specific problems. New features are not going to
+be added anymore but if major changes are done to the code base the legacy code
+is updated to still run.
\ No newline at end of file