Sarah Vincent

Datatypes have been split out for properties (https://github.com/tdwg/cd/blob/review/standard/terms/ltc_datatypes.csv) and removed from the termlist file. I won't close this issue because there are a few other tasks rolled up into it.

Created in response to #418

Renamed the class, for secret reasons (consistency, mainly, also good taste 😜)

Updated the property name + examples to reflect that this property/discussion focuses on a lower-level classification than `objectType` which has a new issue assigned: [https://github.com/tdwg/cd/issues/304](https://github.com/tdwg/cd/issues/304).

objectType used to be issue [https://github.com/tdwg/cd/issues/64](https://github.com/tdwg/cd/issues/64) - see thread under there for relevant discussion.

Updated the Notes field to clarify how this class is related to dwc:Event.

Would using the generic [foaf:Organisation](http://xmlns.com/foaf/spec/#term_Organization) class work? Seems to be flexible enough to cover a legal 'organization' as well as subunits like department/division (the range of which presumably would be...

I'm struggling to see much difference between this and #62 (og.thematicFocus) - do we need them both?