Simplify NNUE Code

[jhonnold]

Bench: 5369258

Chunking loop code results in GCC properly auto vectorizing code. By taking advantage of this, I can simplify away a significant amount of code within Berserk with no functional change.

https://godbolt.org/z/Gz9sqzfqh

Not SPRT tested.

PS C:\Programming\EngineTests> python .\speedup.py
            berserk.exe             |             master.exe             |
        mu              sigma       |        mu              sigma       |   Sp(1)/Sp(2)      3*sigma
------------------------------------+------------------------------------+------------------------------------
       2886697.000             0.000|       2839374.000             0.000|       1.667 %  +/-  0.000 %
       2898431.500         16595.089|       2850725.500         16053.445|       1.673 %  +/-  0.029 %
       2902343.000         13549.833|       2862199.000         22886.244|       1.405 %  +/-  1.397 %
       2904298.750         11734.500|       2867935.750         21927.790|       1.270 %  +/-  1.397 %
       2905472.200         10495.656|       2871377.800         20490.474|       1.190 %  +/-  1.325 %
       2902084.500         12529.409|       2873672.500         19169.807|       0.991 %  +/-  1.878 %
       2903239.000         11838.574|       2875311.571         18028.879|       0.974 %  +/-  1.720 %
       2900977.375         12690.537|       2873657.250         17334.946|       0.953 %  +/-  1.603 %
       2901998.333         12259.679|       2875106.111         16787.811|       0.937 %  +/-  1.506 %
       2900468.200         12530.476|       2873803.200         16355.178|       0.929 %  +/-  1.421 %
       2899216.273         12591.747|       2874975.364         15995.509|       0.845 %  +/-  1.589 %
       2898173.000         12537.914|       2873900.500         15699.065|       0.846 %  +/-  1.515 %