wip, renderItem/representation in-place update

src/mol-app/ui/transform/spacefill.tsx

src/mol-geo/representation/structure/index.ts

src/mol-geo/representation/structure/spacefill.ts

src/mol-geo/shape/mesh-builder.ts

src/mol-geo/util/color-data.ts

src/mol-gl/webgl/buffer.ts

src/mol-gl/webgl/render-item.ts

src/mol-gl/webgl/shader.ts

src/mol-gl/webgl/texture.ts

src/mol-view/state/transform.ts