Add MentalExistent hierarchy of classes.

These differ from the MentalEntity class hierarchy in that
MentalExistents are a narrower subset of MentalEntities. MentalEntities
refer to all mental content that needs to be persistently stored to
represent cognitive and personna state.

MentalExistents are content of the mind that specifically represents
existents. I.e: perceptual data, whether structural or implicative.

smocore/include/fantasyArtificedMentalExistent.h

@@ -0,0 +1,24 @@
+#ifndef _FANTASY_ARTIFICED_MENTAL_EXISTENT_H
+#define _FANTASY_ARTIFICED_MENTAL_EXISTENT_H
+
+#include "artificedMentalExistent.h"
+
+namespace smo {
+
+class FictionalFantasyArtificedMentalExistent
+: public FantasyArtificedMentalExistent
+{
+};
+
+typedef FictionalFantasyArtificedMentalExistent Fictaxent, FictFantixent;
+
+class AspirationFantasyArtificedMentalExistent
+: public FantasyArtificedMentalExistent
+{
+};
+
+typedef AspirationFantasyArtificedMentalExistent Aspixent, AsFantixent;
+
+} // namespace smo
+
+#endif