Add very simple 'auto spread' page view mode #300
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- Add a new enum `adapt.viewer.PageViewMode`, which has three values: singlePage, spread and autoSpread. - Replace a boolean parameter `spreadView` for `vivliostyle.viewer.Viewer` with a new parameter `pageViewMode`, whose value can be one of the enum `adapt.viewer.PageViewMode`. - When PageViewMode=autoSpread, the spread view is enabled when the viewport width is at least 1.45 times of the viewport height, which is enough for a pair of pages of A/B paper sizes (which have an aspect ratio of 1:sqrt(2)).
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adapt.viewer.PageViewMode, which has three values: singlePage, spread and autoSpread.spreadViewforvivliostyle.viewer.Viewerwith a new parameterpageViewMode, whose value can be one of the enumadapt.viewer.PageViewMode.