~macaptain/lkdo-chess

Rename resetBit to unsetBit
Add subOccupancy function for generating submasks
Add comptime arrays for number of relative occupancies
Add bishop attack rays and rook attack rays functions
Add root relative occupancy mask; refactor bishop occupancy mask
Add bishop relative occupancy mask
Add king attacks with tests
Add knight attacks with tests
Add pawn attack tables and tests
Add GPL v3 license and README
Add functions for basic bitboard ops and printing the bitboard