Refactor random usage and memory management

[Duzzuti]

instead of using slow and memory-hungry distributions (deck is 10kB, instead of 105Bytes), we can use std::rand and std::random_shuffle in combination with std::srand(). srand() is called once in main and we can use all other random methods.

Also there should be tests for entropy of these methods.

Moreover heap usage should be minimalized. We dont need to allocate heap memory for a 104Bytes array (deck)

This will be benefical for performance and memory as well as readability.