Move logic for tiling from Servo into rust-layers

Pull in the quadtree implementation from Servo and rework the way that
tiles are stored in the layer tree. Instead of storing tiles in-tree,
simply hang them off of ContainerLayer separately. Also have
ContainerLayer templatized to hold arbitrary data, which will prevent
Servo from having to mirror the tree using Servo CompositorLayers.
I bet the `{}` below and this comment are obsolete; can you remove them?