Moved fileExists function to UtilityBase
Prepared parser function for semantics descriptor files
Implemented loading of semantics descriptor files into CExporterOwl

This might break operation that need the failure mappings in OWL classes for configurations where the workspace directory cannot be resolved. Better replace the dynamic path resolution (i.e. '${PACKAGE beliefstate}') in the config.cfg file by the absolute path if that problem comes up. The beliefstate core component should complain if this becomes a problem, so watch out for the warning messages.