updated cif schemas, added chem_comp_related and chem_comp_synonyms

README.md

data/mmcif-field-names.csv

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

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

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

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