Render: Instancing manager

[eprikazchikov]

Is your feature request related to a problem? Please describe.

To improve performance, it would be nice to have a special instancing manager.

Describe the solution you'd like

Instancing manager will analyze the scene to find the renderable dynamic objects which will have the same meshes and materials and sets of the textures. And will try to unite them to the Instancing buckets. It will help to decrease the number of draw calls during a rendering.

Describe alternatives you've considered

N/A

Additional context

Probably it will require a special flag to allow Instaning manager to add a renderable object to the bucket,