mmcif schema: use lowercase instead of uppercase

src/cli/cifschema/util/cif-dic.ts

src/cli/cifschema/util/generate.ts

src/cli/cifschema/util/schema.ts

src/examples/proteopedia-wrapper/helpers.ts

src/mol-io/reader/cif/schema/bird.ts

src/mol-io/reader/cif/schema/ccd.ts

src/mol-io/reader/cif/schema/mmcif-extras.ts

src/mol-io/reader/cif/schema/mmcif.ts

src/mol-io/writer/mol/encoder.ts

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

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

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

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

src/mol-model-formats/structure/property/bonds/chem_comp.ts

...mol-model-formats/structure/property/bonds/struct_conn.ts

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

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

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

src/mol-model/structure/query/queries/internal.ts

src/mol-model/structure/query/queries/modifiers.ts