Added ol/start support

app/src/main/java/eu/faircode/email/HtmlHelper.java

@@ -2117,7 +2117,11 @@ public class HtmlHelper {
                                     else
                                         ssb.setSpan(new BulletSpan(dp6, colorAccent, dp3), start, ssb.length(), Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
                                 else {
+                                    // https://developer.mozilla.org/en-US/docs/Web/HTML/Element/ol
                                     int index = 0;
+                                    String s = parent.attr("start");
+                                    if (!TextUtils.isEmpty(s) && TextUtils.isDigitsOnly(s))
+                                        index = Integer.parseInt(s) - 1;
                                     for (Node child : parent.childNodes()) {
                                         if (child instanceof Element &&
                                                 child.nodeName().equals(element.tagName())) {