Shows that second chance handler gets the same modified context as the exception handlers.

Shows that the first chance handler gets a unmodified context.
Shows that changing the context has no effect when exception is not handled by debugger.

- Clear title bar when creating new document.
- Remove newline from statusbar.
- Add horizontal line to toolbar.

Test for rectangles with x1 > x2 and y1 > y2. Empire earth passes such rects.