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New version chess engine: Nectar 0.1.7 and NNUE

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Nectar - UCI chess engine
Author: Dragjon

The engine was created recently and has not played enough games yet to be on the CEDR ranking list. Tests of this version soon.

v 0.1.7:
Changed train epoch 50 to 70
Score of NectarV0.1.7 vs NectarV0.1.6: 713 - 605 - 269  [0.534] 1587
...      NectarV0.1.7 playing White: 359 - 308 - 127  [0.532] 794
...      NectarV0.1.7 playing Black: 354 - 297 - 142  [0.536] 793
...      White vs Black: 656 - 662 - 269  [0.498] 1587
Elo difference: 23.7 +/- 15.6, LOS: 99.9 %, DrawRatio: 17.0 %
SPRT: llr 2.95 (100.3%), lbound -2.94, ubound 2.94 - H1 was accepted
Sequential NN model
-------------------------------
Hidden layers : 16
Batch size    : 16384
Learning rate : 0.001
Loss          : mean_squared_error
Metric        : mae
Random seed   : 42
Epochs        : 70


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