Mod residues mmCIF export, segmentation data model fixes, other fixes

src/apps/structure-info/model.ts

src/mol-data/int/impl/segmentation.ts

src/mol-data/int/segmentation.ts

src/mol-geo/representation/structure/visual/util/polymer.ts

...ol-model/structure/export/categories/modified-residues.ts

...-model/structure/export/categories/secondary-structure.ts

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

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

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

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

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