Mesh should accept elements or native types as properties

[toxicFork]

i.e. all of these should be equivalent:

// to be deprecated?

<mesh>
  <boxGeometry width={5} height={5} depth={5} />
  <meshBasicMaterial color={0xff0000} />
</mesh>

<mesh
  geometry={<boxGeometry width={5} height={5} depth={5} />}
  material={<meshBasicMaterial color={0xff0000} />}
/>

const myGeometry = new BoxGeometry(5, 5, 5);
const myMaterial = new MeshBasicMaterial({ color: 0x00ff00 });

<mesh
  geometry={myGeometry}
  material={myMaterial}
/>

[toxicFork]

obsolete (also kind of done)