ui, spacefill visibility and structure center

src/mol-app/ui/controls/common.tsx

src/mol-app/ui/entity/tree.tsx

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

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

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

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

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

src/mol-view/controls/trackball.ts

src/mol-view/state/entity.ts

src/mol-view/state/transform.ts

src/mol-view/viewer.ts