Fix Reanimator not producing spawn eggs anymore.
Includes a fix for BOEC's lying about not being empty.
Fix Blood dupe glitch on auto-exporting tiles.
Fix Invigorating pendant crash on servers.
Fix SMP issue client-side Bound Blood Drop not showing real # essence.
This fix introduces a quite complex client-side proxy with the server
sending updates to the client(s) when required to tell them the new life
essence amounts, since Blood Magic does not delegate these amounts to
the clients itself, so we have to do it. If BM would implement this
itself, it would be probably much more efficient.