SUM: State related buttons are now colored.

SUM: Added a lot of meta information to states.

SUM: Added a secondary action that filters by one state.

SUM: Added filtering by states.

SUM: Use a new memento format.

CHG: The new memento format only stores state and state model ids.

SUM: Added explicit state models.

SUM: Items now use mementos to save their state.

SUM: Some convenience functions add bug fixes.

SUM: Changed the state update logic a bit.

SUM: A package to generate unique ids.

SUM: Add support for states.

SUM: Added an entry to the open menu.

SUM: Simple loading for NuMach.

SUM: We now can move TODO items by drag and drop.

SUM: Fixed a bug when creating new items.

SUM: Use our new top level morph property to to the right thing for top level morphs.

SUM: Mark top-level system morphs as such.

SUM: Saving is delegated up the hierarchy.

SUM: First useable version of our TODO app.

SUM: Fixed layout of window set button in system windows.