wip/runtime2: Layers are not reordered on runtime side when they are reordered on editor

wip/runtime2:

Layers are not reordered on runtime side when they are reordered on editor.

E.g. Add two layers and overlapping objects on them. Save and reload. Note the order of the overlapping objects. Reorder the layers on the timeline -> Objects on topmost layer should come to front, but the order doesn't change on the scene view. Reloading presentation corrects the order.