Changes

* [[General Setwise Operations]]: operations, functions to manipulate bitboards such as set, clear bits in specific indexes, compare them...* [[Population Count]]: count all bit 1s, answer some questions such as how many pieces the Black side has* [[BitScan]]: find index of a bit 1 (usually the most left or most right), answer questions such as where a Rook is or where the target squares of a given Knight are. Those functions are called in high frequency when generating moves and evaluating