Human-readable type of C4V_Any changed to 'nil'

This lowers the confusion factor of error messages like
'ERROR: operator "=" left side: got "any", but expected "&"!'
since nobody really knows what any is.

engine/src/C4Value.cpp

@@ -248,7 +248,7 @@ const char* GetC4VName(const C4V_Type Type)
 	switch(Type)
 	{
 	case C4V_Any:
-		return "any";
+		return "nil";
 	case C4V_Int:
 		return "int";
 	case C4V_Bool: