OpenMW-CS: Convert Columns in Filters
References to columns in filters can appear in a numerical form or as string. These references should be saved in the numerical form when ever possible (to avoid problems with localisation), but presented to the user as a string (again, whenever possible).
The conversion can be performed via the filter parser.
(RM-914 from redmine: created on 2013-09-27 by Marc Zinnschlag, )