Add support for 'EntryType.Entries.All' in HeadsUp.updateDisplay()

[dgets]

The code referenced in issue #12 needs to take advantage of the EntryType.Entries.All enumeration in order to be able to iterate over all of the list types when updating the display.

[dgets]

Now that I put together an object that can contain all of the active lists (see closed issue #20), it may be a hell of a lot simpler to get this done...