EquirectangularTile
data class EquirectangularTile(val left: Double, val top: Double, val right: Double, val bottom: Double) : SphericalProjection
A part of an Equirectangular picture. Each bound is the share of the whole picture's width or height that lies beyond this part's edge on that side, from 0 to 1, so the whole picture is this one's width divided by 1 - left - right and its height divided by 1 - top - bottom. The container stores each as 0.32 fixed point, and each is that number over 2^32, exactly.