Rename CollectionDescriptionScheme class to LatimerCoreScheme

[mswoodburn]

Updates required:

1. term CSVs
   • [x] ltc_categories.csv
   • [x] ltc_datatypes.csv
   • [x] ltc_skos_mapping.csv
   • [x] ltc_standard_terms_draft.csv
   • [x] by namespace
2. normative documentation
   • [x] landing_page.md
   • [x] termlist-header.md
   • [ ] ? "data_model" readme + definition docs? ?
3. wiki (fairly widespread)
   • [ ] wiki search for "CollectionDescriptionScheme"
   • [ ] wiki search for "Collection Description Scheme"
4. wiki diagrams
   • [ ] - Wiki Home - Overview
   • [ ] - check other wiki-pages
5. JSON Schemas and JSON/CSV examples
   • [ ] - main class
   • [ ] - classes related via range or class-level properties

[magpiedin]

holding off from editing the following (for reason noted)

• "data_model" readme + definition docs (these appear to be docs that will/should be autogenerated &/or replaced by website when it's up)
• wiki searches + manual checks (pending reviewer edits/changes)
• JSON schema (to be autogenerated from the updated terms CSVs