Create new array shuffled flow based on the Refinery. Refactor old sh…

[lscharmer]

The new implementation uses the shuffle(...) function instead of the ilArrayElementShuffler::mtShuffle(...) method because since PHP 7.1 shuffle() already uses the Mersenne Twister algorithm. (see https://www.php.net/manual/en/function.shuffle.php)

The existence check for mt_srand and mt_rand is also removed, because it is replaced by srand in PHP 7.1 (see https://www.php.net/manual/en/function.mt-srand.php)

Because all ILIAS\Refinery\Transformation's must be pure and the seeding of the random number generator is not, the ShuffleTransformation returns an Effect which can be called to seed the random generator and shuffle the previously given array (which then will be returned).

This way no side effect is done in the Transformation class itself.

[mjansenDatabay]

• Please create a random() method in src/Refinery/Factory.php
• RandomGroupshould only be instantiated within this method in theRefinery Factory (and in unit tests)
• Please don't create instances in consuming code, alway use $DIC->refinery()->random().