Add features and limitations to the project.

Also update the types to be stricter.

Add handling to extreme/sentinel values.

Add tests related to error handling.

Traditional British long count is available for systems.

Only largest millia should remove prefix when group is 001.

Make word positive when making negative a negative number.

Make short millia parse and stringify correctly.

Use special millions prefix only when millia is less than one.

Add en-UK locale with same short count as en-US.

Add namespace for short/long count. Also manage conversion configs and defaults.

There is only a certain string length allowed to convert parsed numbers to bigint.

Ensure strings are properly sanitized before processing.

Ensure exponents are normalized properly.

Use bigint for place values to be more adaptable with longer inputs.

Put functions with different purposes into their own files.

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.