Merge exid-types.json with gedcom-registries

[tychonievich]

exid-types.json predates gedcom-registries, and has some overlap with it (in particular, it duplicates the semantic purpose of https://github.com/FamilySearch/GEDCOM-registries/tree/main/uri/exid-types). We should merge these two to avoid duplicate information, probably keeping the registries because it is more versatile.

[dthaler]

exid-types has: label, type, description, contact, change-controller, and reference.

These can be mapped to https://gedcom.io/terms/format fields as follows:

• label -> label
• type -> uri
• description -> specification
• contact -> contact
• change-controller ("FamilySearch" for AFN/RIN/RFN) ->??? no current field
• reference -> ??? no current field

[dthaler]

Filed FamilySearch/GEDCOM.io#220 in GEDCOM.io regarding change-controller and reference.

[tychonievich]

Adding one entry:

• reference -> documentation

(see https://gedcom.io/terms/format)

[dthaler]

FamilySearch/GEDCOM-registries#102 added the data from exid-types.json to gedcom-registries. exid-types.json can now be deleted.