Refactoring mol-model

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

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

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

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

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

...l-model/structure/model/properties/atomic/conformation.ts

src/mol-model/structure/model/properties/atomic/hierarchy.ts

src/mol-model/structure/model/properties/atomic/measures.ts

...structure/model/properties/coarse-grained/conformation.ts

...el/structure/model/properties/coarse-grained/hierarchy.ts

src/mol-model/structure/model/properties/common.ts

src/mol-model/structure/model/properties/sequence.ts

src/mol-model/structure/model/utils/hierarchy-keys.ts

src/mol-model/structure/query/properties.ts

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