wip structure level properties

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

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

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

src/mol-model-props/common/custom-element-property.ts

src/mol-model-props/common/custom-property-registry.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/structure.ts

src/mol-model/structure/common/custom-property.ts

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

src/mol-model/structure/model.ts

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

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

src/mol-model/structure/model/properties/custom/chain.ts

...mol-model/structure/model/properties/custom/collection.ts

src/mol-model/structure/model/properties/custom/residue.ts

src/mol-script/runtime/query/compiler.ts

src/perf-tests/mol-script.ts