MVP of [1603:??:1603] /HXL/; focus on pre-compile replacement maps

[fititnt]

• https://github.com/HXLStandard/hxl-proxy/wiki/Replacement-maps
• https://github.com/HXLStandard/libhxl-python/wiki/Replacement-maps

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The HXL standard, except for document own vocabulary (which do in fact is relevant here), could be used, could have a neutral namespace for put data there. But he focus of this MVP is [1603:??:1603], in special standard way to replacement data.

I think most use cases for Replacement-maps are common misspellings or translate nomenclature from one language to another. Which, by the way, would be very relevant if we go further extracting translations from MVP of read access to Wikidata #3. However an more immediate use could be simple we also generate table conversions from one coding standard, such as ISO 3661-2 (https://en.wikipedia.org/wiki/List_of_ISO_3166_country_codes) to UN m49 (https://unstats.un.org/unsd/methodology/m49/) the one we use here.