message: fix(message-parser): Escaping only necessary characters
diff: @@ -149,7 +149,7 @@ Inline
  Whitespace = w:$" "+ { return plain(w); }
  -Escaped = "\\" t:$. { return plain(t); }
  +Escaped = "\\" t:$("*" / "_" / "~" / "`" / "#" / ".") { return plain(t); }
  Any = !EndOfLine t:$. u:$URL? { return plain(t + u); }
  @@ -297,10 +297,6 @@ unicode
  return String.fromCharCode(parseInt(digits, 16));
  }
  -escape
  - = unicode
  - / "\\" ch:[^\r\n\f0-9a-f]i { return ch; }
  -
  AutolinkedPhone = p:Phone { return link('tel:' + p.number, plain(p.text)); }
  AutolinkedURL = u:URL { return link(u); }
  