Replace ORDER_RANDOM with getVerticesShuffled(), getVertexRandom(), getEdgesShuffled() and getEdgeRandom()

[clue]

// old
$vertices->getVerticesOrder(Vertices::ORDER_RANDOM);
$vertices->getVertexOrder(Vertices::ORDER_RANDOM);
$edges->getEdgesOrder(Edges::ORDER_RANDOM);
$edges->getEdgeOrder(Edges::ORDER_RANDOM);

// new
$vertices->getVerticesShuffled();
$vertices->getVertexRandom();
$edges->getEdgesShuffled();
$edges->getEdgeRandom();