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fix: Better word matching regex (#110)

feat: word matching regex and add substitute API

Problem:
The old implementation of word finding RegExp also matches communiqu
of the word communiqué, which can lead to mis-hyphenation.
One-step RegExp to correctly match words is not possible.
(For details see issue #109.)

Solution:
First find all words using a transpiled form of
RegExp `/[\p{Letter}]{n,}/gui`. This RegExp is quite large.
It is minimized by collecting all characters used by patterns.
Then in replacer-function test if all characters are in `lo.alphabet`.
With this words containing a char not in lo.alphabet are not
hyphenated at all. By substituting foreign characters such words
can be hyphenated.
So also add an API to substitute characters and document this API.

Notes:
This commit requires all .wasm files to be regenerated.

Fixes #109

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