wip, schema generation scripts

data/mmcif-usage-counts.txt

examples/mmcif-entity.json

src/mol-io/reader/cif/text/parser.ts

src/scripts/generate-schema.ts

src/scripts/schema-from-mmcif-dic.ts

src/scripts/schema-generation/cif-dic.ts

src/scripts/schema-generation/generate.ts

src/scripts/schema-generation/json-schema.ts

src/scripts/schema-generation/validate.ts

src/scripts/validate-schema.ts