More WIMPification #

- Decided that backend and UI should be loosely coupled (UI does no processing in and of itself, but it directly invokes (and is aware of) the backend).
- Made UI display images as they are loaded (for originals) or processed (differences)
- Added menu commands and key shortcuts for UI to display different versions of the image and to navigate between images.
- Did crude stroke rendering of strokes (lines and points), but for dummy strokes only (no actual stroke computation done).

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