Pre-Compute Non-Pawn Move Masks

[Bonifatius94]

Issue:

• computing king / knight / sliding piece masks may be expensive
• it can be pre-computed and stored in an array, improving the overall draw-gen performance

Suggested Solution:

• run pre-computation when loading the module, caching common move masks in arrays
• for king / knight moves: replace the computation by a simple lookup
• for sliding piece moves: combine a lookup with some bit hacks like hyperbola quintessence to determine blocking pieces