default Set<BlockPos> getAdditionalSticks() {
        return Collections.emptySet();
    }
Optional method used to declare additional blocks that need to move along
with this block. Useful in situations where you want multiple non-adjacent
blocks to act as a single structure.

@return Set of blocks that are stuck to this block.
api/src/main/java/mrtjp/projectred/api/Frame.java