refactored ModelFormat

src/apps/viewer/extensions/cellpack/model.ts

src/mol-model-formats/structure/3dg.ts

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

src/mol-model-formats/structure/basic/schema.ts

src/mol-model-formats/structure/common/component.ts

src/mol-model-formats/structure/common/entity.ts

src/mol-model-formats/structure/format.ts

src/mol-model-formats/structure/gro.ts

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

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

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

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

src/mol-model-formats/structure/psf.ts

src/mol-model-props/common/wrapper.ts

src/mol-model-props/computed/secondary-structure.ts

src/mol-model-props/pdbe/preferred-assembly.ts

src/mol-model-props/pdbe/struct-ref-domain.ts

src/mol-model-props/pdbe/structure-quality-report.ts

src/mol-model-props/rcsb/assembly-symmetry.ts

src/mol-model-props/rcsb/validation-report.ts