Merge pull request #6 from molstar/ply-test

src/mol-io/reader/ply/parser.ts

src/mol-io/reader/ply/schema.ts

src/mol-model-formats/shape/ply.ts

src/mol-model-formats/structure/_spec/pdb.spec.ts

src/mol-model-formats/structure/pdb/to-cif.ts

src/mol-model/shape/provider.ts

...l-model/structure/model/properties/utils/guess-element.ts

src/mol-plugin/state/transforms/data.ts

src/mol-plugin/state/transforms/model.ts

src/mol-plugin/state/transforms/representation.ts

src/mol-util/array.ts