Wand objects now process commands slightly differently when right-clicked, and it's possible to get x, y, z of selected block.
Commented out onItemRightClick functionality for wands until I can work out how to enable using the item on nothing in particular without doubling usage when using it on a block.
Also shifted command processing to a separate method from onItemRightClick/onItemUse.
Enabled substitution!
%x: X-coordinate of block
%y: Y-coordinate of block
%z: Z-coordinate of block