Fix EditSession being created for commands that don't need it
Fix error from schematic list (when there are files in sub directories)
Fix dispatcher redundantly checking a huge number of permissions
For example, the getChunks method returns a Set<Vector2D> which is
actually comprised of BlockVector2D, so using set.contains(some vector)
will always return false.
There's unlikely to be multiple entities on the same block, or above
y=256, so using the int coords is better.
Jesse Boyd
