initial pass at making listfield take a list of options to validate against
initial pass at making listfield take a list of options to validate against

mlyundin/schematics,not-napoleon/schematics,ee08b397/schematics,kaiix/schematics,kstrauser/schematics,openprocurement/schematics,ee08b397/schematics,eatfirst/schematics,kstrauser/schematics,promptworks/schematics,nKey/schematics,not-napoleon/schematics,promptworks/schematics,NerdWallet/schematics