fake screen space shadow, second pass ssao

src/apps/docking-viewer/viewport.tsx

src/examples/lighting/index.ts

src/extensions/cellpack/model.ts

src/mol-canvas3d/passes/draw.ts

src/mol-canvas3d/passes/postprocessing.ts

src/mol-gl/renderer.ts

src/mol-gl/shader/postprocessing.frag.ts

src/mol-gl/shader/ssao.frag.ts

src/mol-plugin-ui/structure/quick-styles.tsx