added description from dictionary to mmcif schema

src/apps/schema-generator/generate-typescript.ts

src/apps/schema-generator/schema-from-mmcif-dic.ts

src/apps/schema-generator/util/cif-dic.ts

src/apps/schema-generator/util/generate.ts

src/apps/schema-generator/util/schema.ts

src/apps/schema-generator/util/validate.ts

src/apps/schema-generator/validate-schema.ts

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

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

src/mol-util/index.ts