Implement TD-Leaf

[ranzuh]

I want to try to implement TD-Leaf to learn weights to linear evaluation function. If this attempt is successful, later I'd like to implement RootStrap or TreeStrap.

Tasks to implement TD-Leaf to CppChess

• Weights in and out of current format? #2
• Extract features for linear evaluation function #3
• Research how to save the weights between games/runs #4
• Figure out how to do self play, first do without selfplay against bbc, vice, blunder? #5
• How to detect that game has ended to start the training #6
• Store pv leaf positions