WoltLab/WCF — pull request #718 by Gravatronics (2012-07-22 08:51:28+00:00)
Title: Reworks parts of the category system

* Moves ACL-related parts to ACL package.
* Removes `objectTypeCategoryID`; use `categoryID` instead.
* Makes it possible to have optional description (-> can be empty).

**API of `wcf\system\category\ICategoryType` changed a bit because of these changes**