Support search with or without diacritics (bug 1508345, bug 916883, bug 1651113)

- get original index in using a dichotomic seach instead of a linear one;
  - normalize the text in using NFD;
  - convert the query string into a RegExp;
  - replace whitespaces in the query with \s+;
  - handle hyphens at eol use to break a word;
  - add some \s* around punctuation signs

web/app.js

@@ -2592,6 +2592,7 @@ function webViewerFindFromUrlHash(evt) {
     entireWord: false,
     highlightAll: true,
     findPrevious: false,
+    matchDiacritics: true,
   });
 }