Rethink hierarchial design

[bvssvni]

The way it currently works, is each Sprite having children. When it renders, it renders first the parent and then the children. Each Sprite stores a Uuid.

[bvssvni]

I would like to remove the Uuid and children from Sprite and store this information externally in Scene.

[bvssvni]

The order the sprites are rendered should be determined by a flat list, such that one can reorder them without having to change the hierarchy.

[bvssvni]

I would like to avoid storing Uuid in Sprite, since it is used as Rc<Sprite>.

[bvssvni]

Perhaps it would be better to use Rc<Texture> instead and just store Vec<Sprite> in Scene.