Andy McFadden 5635a1e33a Add Atari 2600 sprite/playfield visualizer ...

First swing at a visualizer for Atari 2600 sprites and playfields.
Won't necessarily present an accurate view of what is displayed on
screen, but should provide a reasonable shape for data stored in
the obvious way.

The Adventure playfields looked squashed, so I added a simple row
duplication value.

Also, minor improvements to visualizers generally:
- Throw an exception, rather than an Assert, in VisBitmap8 when the
  arguments are bad.
- Show the exception in the Visualization Edit dialog.
- If generation fails and we don't have an error message, show a
  generic "stuff be broke" string.
- Set focus on OK button in Visualization Set Edit after editing,
  so you can hit Enter twice after renaming a tag.

2019-12-06 17:33:29 -08:00

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