v1.4 Check Extensions

Changelog

• Added code for extracting win/draw/losses as well as the reasons from the pgn file

v1.4

• Fixed killer heuristic bug storing on captures and promotions instead of the opposite
• Removed clearing of killer heuristics after every iterative deepening
• Switched to fail-hard search for consistency with online resources
• Implemented check and passed pawn (2nd or 7th rank) extension

Performance
v1.4 🟩🟩🟩🟩🟩🟩🟩🟩🟩🟩🟩🟩🟩🟩🟩🟩🟩⬜🟥🟥 v1.0 [333 / 25 / 42]
v1.4 🟩🟩🟩🟩🟩🟩🟩🟩🟩🟩🟩🟩⬜⬜🟥🟥🟥🟥🟥🟥 v1.3 [244 / 40 / 116]