Convert representation of sex to use OntologyTerm rather than have a special case enum that is different than all other metadata.
Convert representation of sex to use OntologyTerm rather than have
a special case enum that is different than all other metadata.

nlwashington/schemas,diekhans/ga4gh-schemas,ga4gh/ga4gh-schemas,sarahhunt/schemas,diekhans/ga4gh-schemas,buske/schemas,hjellinek/jeltje-schemas-sphinx,adamnovak/schemas,kellrott/schemas,saupchurch/schemas,lh3/schemas,hjellinek/schemas,macieksmuga/schemas,dnanexus-rnd/schemas,heuermh/ga4gh-schemas,Jeltje/ga4gh-schemas,dcolligan/schemas,hjellinek/schemas,pcingola/schemas,Jeltje/ga4gh-schemas,lh3/schemas,delagoya/schemas,laserson/schemas,sarahhunt/schemas,delagoya/schemas,dglazer/schemas,buske/schemas,benedictpaten/schemas,kellrott/schemas,benedictpaten/schemas,nlwashington/schemas,laserson/schemas,dnanexus-rnd/schemas,ga4gh/schemas,adamnovak/schemas