Release v4.17.0

Added

• controlsIcons on Canvas (icons on CanvasControls) replaces any of the minimap, zoom-out, zoom-in and help glyphs with your own icons. Unset fields keep the built-in icons, and the accessible names still come from controlsLabels.
• controlsFollowViewportInsets on Canvas (followViewportInsets on CanvasControls) turns off the offset by --canvas-viewport-left/--canvas-viewport-right, for hosts that already move the canvas by that inset. It defaults to true, so existing canvases are unchanged.
• The --canvas-viewport-left and --canvas-viewport-right custom properties the controls read are now documented.