flexmark-java extension for typographic processing

Converts:

- `'` to apostrophe `&rsquo;` ’
- `...` and `. . .` to ellipsis `&hellip;` …
- `--` en dash `&ndash;` –
- `---` em dash `&mdash;` —
- single quoted `'some text'` to `&lsquo;some text&rsquo;` ‘some text’
- double quoted `"some text"` to `&ldquo;some text&rdquo;` “some text”
- double angle quoted `<<some text>>` to `&laquo;some text&raquo;` «some text»