finally change List to derive from data object

can’t derive from data16 as some lists are longer
have to get the delegation to work first

lib/parfait/data_object.rb

@@ -30,8 +30,8 @@ module Parfait
     def data_length
       raise "called #{self}"
     end
-    def data_start
-      return get_type.get_length
+    def self.type_length
+      raise "called #{self}"
     end
   end
 
@@ -69,4 +69,9 @@ module Parfait
       16 * 4
     end
   end
+  class Data32 < DataObject
+    def self.memory_size
+      32
+    end
+  end
 end