Move order - Captures + MVV LVA

[mateusz2173]

We'd like traverse moves in specific order.
The move which is most likely the best move is PV (Principal Variation) move, meaning main move in our search line.
Captures are more likely to improve alpha than other moves, therefore evaluating them right after PV move would cause more tree cutoffs in average

DoD:

• Implement move ordering. PV move should be searched first, then captures, then other moves (if needed)
• Additionally, sort captures using MVV LVA heuristics

https://www.chessprogramming.org/MVV-LVA

Hint:
Position is PV node iff beta - alpha <= 1 (meaning alpha ~= beta)