Code cleanup BlockDualVertical. Prevent NPE's in name for DualVerticals
Allow objects to be placed on the top, back and some sides of dualVertical's
Fix ghost blocks being created when right clicking constructor with another constructor
Further NPE checks
Tidy up onUpdate in DualVertical and added some error messages and checks
Attempt to prevent isDeathSyncing never being unset
Add in sync command for debugging purposes