Put functions with different purposes into their own files.

Use latest vitest and coverage-v8 packages.

Use appropriate place instead of smallest group when creating placeholder groups between actual groups.

Make group management more readable.

Formal English hyphenates tens names.

Address errors with gapped groups.

Ensure digits parse correctly when there are gaps.

Make code more cleaner when parsing.

Format more sections of the code.

Use ESLint for formatting.

Include parse and stringify functions for American short-count locale.

The inputs are now trimmed before conversion.

The TODO items are updated for possible correct formats.

Ordinals have been implemented in both English and German (tho I'm not
sure how to check correctness of German number names and ordinals).

Also, refactored code to have common rules for a language, and special
rules for each variant (in the future, French will have this structure
handy).

Make sure cases from chongo are accounted for.

Add files from pridepack.