Release v2.2.1

🚀 New release!

🔄 Changelog:

• removed bonus for knight mobility to reduce evaluation time (Nateml)
• feat: enhance evaluation function with positional bonuses for castling, bishop pairs, and rook positioning (Nateml)
• fix: update transposition table size to prime number to improve performance (Nateml)
• remove castle notation from Move class output (Nateml)
• feat: add initial release binaries and configuration files for ChessBot (Nateml)
• refactor: update transposition table size validation and indexing method (Nateml)
• added null move pruning (Nateml)
• made the bot search run on a different thread from the UCI interface, and made the search check if a stop has been requested (Nateml)
• added 3-fold repetition detection and 50-move rule to the search (Nateml)