Extension that adds GEDCOM-X names to GEDCOM 7

[tychonievich]

I wrote this extension as a proof of concept some time ago, but since then have started using in my ongoing work on extracting GEDCOM 7 files from the FamilySearch Family Tree API, and hence expect it to start appearing in files I create that other applications might encounter. Registering in the extension registries thus seems useful.

[albertemmerich]

Need more explanations. I see a conflict to standard tags as GIVN, SURN, SPFX, NSFX, and to NAME.TYPE with several standardized and possible extended payloads. Please show GEDCOM code samples of the use of the proposed extensions.