LPS-27530 BookmarksFolder changes for new staging

Hey Julio,

This is re-sending the BookmarksFolder changes. I've tried a different approach as we discussed earlier. Unfortunately by following this approach of arranging the commits i don't think it's possible to push the entries portion as well, so I'm going to wait until this gets in.

So basically the portlet data handler code is in a temporary phase right now it will change more, this is for the better understanding.

What do you think about these changes?

Thanks,

Máté