- Line width could be based on zoom level (up to a max number of columns) or max zoom so as to fit on a fixed number of columns/pages. Will go with 2nd option first.
- MeasureOverride and ArrangeOverride really need to do much of the same stuff and it seems a bit silly to do it twice. For now I'll do it all in Arrange and have Measure just return the max available size. I guess I'll have to change this if the ScorePanel ever wants to be smaller than the maximum.
- ScoreLines shouldn't just stretch to fit since they have different widths. We pass available width in to line to get desired height, but the line might not use the whole available width. I guess the lines still need to use the zoom property.
- Padding between pages will be zoomed too.