Populated the value of piece_bb[NO_PIECE] #14
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It is initialized to all '1's in default Position constructor; The value is updated in put_piece, remove_piece, move_piece and move_piece_quiet methods
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The idea was to make piece_bb[NO_PIECE] usable. It is not required for move generation, as it can always be derived form other bit boards. However, I have found not having this value readily accessible to be unintuitive.
It is initialized to all '1's in default Position constructor;
The value is updated in put_piece, remove_piece, move_piece and move_piece_quiet methods
Updated generate_legals and ran perft to validate correct behavior.
Hopefully i have not missed anything