since BlockTransaction was designed to be World-agnostic, it can't position() any blocks, since Position requires a World.
This workaround is the best we can do for now; however, it would probably be wise to deprecate getTransaction() in favour of a dedicated getBlocks() method which takes care of this, as BlockPlaceEvent is currently quite obnoxious to use.
BlockPlaceEvent no longer extends BlockEvent, since it's now a multi-block event
getBlockReplaced() is removed
getTransaction() is added
to be honest, BlockPlaceEvent should be something like PlayerBlockPlaceEvent...
