begin refactoring AppUpdate structure

temp-squares/temp.mlb

@@ -2,16 +2,22 @@ $(SML_LIB)/basis/basis.mlb
 
 (* FUNCTIONAL CORE *)
 fcore/app-type.sml
-fcore/click-points.sml
-fcore/app-init.sml
-fcore/app-with.sml
 
 ann
   "allowVectorExps true"
 in
+  fcore/ndc.sml
   fcore/graph-lines.sml
 end
 
+fcore/click-points.sml
+fcore/app-init.sml
+fcore/app-with.sml
+
 message-types/draw-msg.sml
 message-types/file-msg.sml
 message-types/input-msg.sml
+message-types/update-msg.sml
+
+fcore/app-update.sml
+