feat: support divorces, add marriage information

[fbiville]

The existing IS_MARRIED_TO has been changed to IS_SPOUSE_OF.

IS_SPOUSE_OF is inferred from family's HUSB / WIFE tags.

IS_MARRIED_TO relationships are now only created if there are
marriage family event information (MARR Gedcom tag).

DIVORCED relationships are created from family divorce event
information (DIV Gedcom tag).

[fbiville]

Note: I'm growing skeptical about the use of present tense in the relationship types.
Do the phrasings IS_SPOUSE_OF and IS_MARRIED_TO make sense when people later divorced? Do they make sense for deceased people?
@dhrudevalia wdyt?

[dhrudevalia]

Note: I'm growing skeptical about the use of present tense in the relationship types. Do the phrasings IS_SPOUSE_OF and IS_MARRIED_TO make sense when people later divorced? Do they make for deceased people? @dhrudevalia wdyt?

hmm yeah i've been thinking but not sure what the best approach would be.

Maybe WED_TO? HAS_BEEN_MARRIED_TO. or even to MARRIED_TO. Without the IS

[fbiville]

Let's maybe follow up in another PR when we get rid of of IS_? Wdyt?

[dhrudevalia]

Let's maybe follow up in another PR when we get rid of of IS_? Wdyt?

Yep that's fine with me.