Feature: change the hands of players

[Theomat]

Hi !

I have implemented new features:

• to return a card from a hand in a deck
• to deal a specific card to a player
• to change the hands of a player to a new hand

These two new moves are not present in the history, and the knowledge of the hand is unaltered.
This enables with a bit of manipulation to do something close to #30.
For example, one could add to each player the card they want to be played, discard, hinted, by changing their hands accordingly and then acting on these hands.

The return and deal specific moves were inspired from mcts-hanabi (under license Apache 2.0), their original implementation was kept for hanabi_hand and hanabi_move.

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[Theomat]

@googlebot I signed it!