Sidecar vertical slide navigator option

[PeterKnoop]

With today's wide-format screens, some users would like to be able to move the Sidecar slide navigator from being a horizontal strip along the bottom of the screen, to being a vertical strip along the side of the screen. They would like a way to change the configuration, perhaps as a setting toggle or by dragging it from one location along an edge to another.

Given the consolidation of the Slideshow block into the Sidecar block as a layout option, it could also be helpful to have the initial orientation of the slide navigator visually reflect the flow of the selected layout. The navigator would be presented vertically by default for the Docked and Floating layouts, and horizontally by default for the Slideshow layout. The orientation of navigator would thus match the vertical scrolling actions a reader performs in a Docked/Floating layout, and the horizontal paging actions a reader uses in a Slideshow layout.