Editor: Change References / Referenceables terminology
The terminology currently used in the editor in generally considered confusing. Therefore it needs to be changed. These are the required changes:
References -> Instance Referenceables -> Object
Note that these changes will be done only to the part of OpenMW-CS that is visible to the user. Internal names (class names and such) will stay as they are.
(RM-2516 from redmine: created on 2015-05-03 by Marc Zinnschlag, , closed on 2015-05-03 by Marc Zinnschlag)