Display and index hyphenated words as normal words

[beatrycze-volk]

Fix for issue #824

As example is used term Bericht der Comminions. In the last line of the snippet Commision was not highlighted becasue of the hyphen. After fix that word is also highlighted. This doesn'T work fully on the image as highlight there comes from the solr-ocrhighlighting plugin.

Before:

After:

This PR contains also workaround in full text for using the solr-ocrhighlighting plugin as it doesn't support hyphens in Mini OCR (dbmdz/solr-ocrhighlighting#35). The first part of the word is indexed as full word and the second part is indexed as space:

if (!empty($attributes['SUBS_CONTENT'])) {
    if ($attributes['SUBS_TYPE'] == 'HypPart1') {
        return htmlspecialchars((string) $attributes['SUBS_CONTENT']);
    }
    return ' ';
}