Tree-wide: Update ratings to mirror the rating state of the svn repo.

* Since the tooling helpers used in the svn installation and the git
  version, a re-rating of all files was required (less work than fixing
  the tooling code that would be only used once).
* Updates the hashes of the classes in the .rating files.
* Removes empty .rating files from directories without ratable files.

Signed-off-by: Alexander Diewald <diewald@fortiss.org>