CAN create-note handler

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• CAN's create-note handler should fire NOTE-CREATED-ERROR on failure
  • CAN's create-note handler will attempt to create a new note at an address in the notebook. If this goes wrong for any reason, the handler should fire a NOTE-CREATED-ERROR event to allow other handlers to listen and respond.
• CAN's create-note handler should fire NOTE_CREATED
  • The create-note handler is intended to create a new note at the correct address within the CAN notebook.
• CAN's create-note handler should listen for COMMAND_ADD
  • CAN's create-note handler is intended to add a new note at the note's address using the current state of the scratchfile to determine which note is added.
• CAN's add command should save the current scratchfile as a note.
  • To get this done, a create-note handler should be created to listen for the COMMAND_ADD event, upon which it should store the note as described above.