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Chess engine: CT800 1.44

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CT800 - UCI chess engine, Homepage
Rating JCER=2385   Author: Rasmus Althoff

Changes from V1.43
Limited mainboard LED flashing to three flashes after reset.
Reduced key repeat timeout from 100 ms to 50 ms.
Improved mate search mode.
Improved general performance.
Improved pawn hash collision handling.
Fine-tuned pruning and eval.
Removed null move threat move.
More late move reductions.
Fixed legality checks in the book tool (no engine impact).

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