wip, dssp assignment

src/mol-model-formats/structure/mmcif/parser.ts

src/mol-model-formats/structure/mmcif/secondary-structure.ts

...-model/structure/model/properties/utils/atomic-derived.ts

...l/structure/model/properties/utils/secondary-structure.ts

src/mol-model/structure/model/types.ts

src/mol-model/structure/util.ts

src/tests/browser/render-structure.ts

webpack.config.js