FE: Implement draw and drawForJoin

[sashak0]

Draw 5 random cards when joinGame
from the player's deck -> hand

0. getDeck - once at the start of the game
1. getRandomness - to do @norswap
2. draw deck[rand] % deck.size
3. update the deck - copy and pop, order will change

function drawForJoin(initialRandomness) {
    randomness = initialRandomness;
    for (i = 1 to 5) {
        draw(randomness);
        randomness = sha256(randomness);
    }
}

function draw(randomness) {
    // todo
}