bump crengine: alternative TOC, no page break on borders (#4011)

Includes:
- Avoid page break between a node and its borders
- Allow building an alternative TOC from document headings

On CRE documents, allows toggling between original TOC and an
alternative TOC with long-press on the "Table of content" menu
item.

Also update the Wikipedia stylesheet to further avoid
page-breaks between images and their caption, so a full
bordered wikipedia thumbnail is always full on a single page.

frontend/document/document.lua

@@ -254,6 +254,14 @@ function Document:getToc()
     return self._document:getToc()
 end
 
+function Document:canHaveAlternativeToc()
+    return false
+end
+
+function Document:isTocAlternativeToc()
+    return false
+end
+
 function Document:getPageLinks(pageno)
     return nil
 end