⚡ Force TT array to have a power of two length

[eduherminio]

Force TT array to have a power of two length

This allows replacing TT index calculation, from zobrist % length -> zobrist & length -1

Score of Lynx 1254 - pow-of-two vs Lynx 1247 - main: 2386 - 2337 - 1487  [0.504] 6210
...      Lynx 1254 - pow-of-two playing White: 1419 - 945 - 742  [0.576] 3106
...      Lynx 1254 - pow-of-two playing Black: 967 - 1392 - 745  [0.432] 3104
...      White vs Black: 2811 - 1912 - 1487  [0.572] 6210
Elo difference: 2.7 +/- 7.5, LOS: 76.2 %, DrawRatio: 23.9 %
SPRT: llr 0.0815 (2.8%), lbound -2.94, ubound 2.94

Windows benchmark results (similar to macOS ones):

 *  | Method |       size |      Mean |     Error |    StdDev | Ratio | Allocated | Alloc Ratio |
 *  |------- |----------- |----------:|----------:|----------:|------:|----------:|------------:|
 *  | Modulo |    2097152 | 97.429 us | 1.8213 us | 1.7036 us |  1.00 |         - |          NA |
 *  |    And |    2097152 |  7.107 us | 0.1393 us | 0.1710 us |  0.07 |         - |          NA |
 *  |        |            |           |           |           |       |           |             |
 *  | Modulo |    4194304 | 95.984 us | 0.9829 us | 0.8713 us |  1.00 |         - |          NA |
 *  |    And |    4194304 |  7.024 us | 0.1348 us | 0.1261 us |  0.07 |         - |          NA |
 *  |        |            |           |           |           |       |           |             |
 *  | Modulo |    8388608 | 98.313 us | 1.9542 us | 1.9192 us |  1.00 |         - |          NA |
 *  |    And |    8388608 |  7.031 us | 0.0797 us | 0.0707 us |  0.07 |         - |          NA |
 *  |        |            |           |           |           |       |           |             |
 *  | Modulo |   16777216 | 96.734 us | 0.8187 us | 0.6392 us |  1.00 |         - |          NA |
 *  |    And |   16777216 |  7.051 us | 0.0885 us | 0.0828 us |  0.07 |         - |          NA |
 *  |        |            |           |           |           |       |           |             |
 *  | Modulo |   33554432 | 97.209 us | 1.0735 us | 1.0041 us |  1.00 |         - |          NA |
 *  |    And |   33554432 |  7.214 us | 0.1191 us | 0.1114 us |  0.07 |         - |          NA |
 *  |        |            |           |           |           |       |           |             |
 *  | Modulo |   67108864 | 97.015 us | 1.4319 us | 1.3394 us |  1.00 |         - |          NA |
 *  |    And |   67108864 |  6.979 us | 0.0889 us | 0.0742 us |  0.07 |         - |          NA |
 *  |        |            |           |           |           |       |           |             |
 *  | Modulo |  134217728 | 96.075 us | 1.2594 us | 1.1164 us |  1.00 |         - |          NA |
 *  |    And |  134217728 |  6.979 us | 0.0808 us | 0.0756 us |  0.07 |         - |          NA |
 *  |        |            |           |           |           |       |           |             |
 *  | Modulo |  268435456 | 96.507 us | 1.6562 us | 1.5492 us |  1.00 |         - |          NA |
 *  |    And |  268435456 |  6.941 us | 0.0405 us | 0.0316 us |  0.07 |         - |          NA |
 *  |        |            |           |           |           |       |           |             |
 *  | Modulo |  536870912 | 95.550 us | 0.7486 us | 0.6636 us |  1.00 |         - |          NA |
 *  |    And |  536870912 |  6.987 us | 0.1078 us | 0.1008 us |  0.07 |         - |          NA |
 *  |        |            |           |           |           |       |           |             |
 *  | Modulo | 1073741824 | 95.537 us | 0.9683 us | 0.8584 us |  1.00 |         - |          NA |
 *  |    And | 1073741824 |  7.036 us | 0.0775 us | 0.0687 us |  0.07 |         - |          NA |

Linux ones

 *  BenchmarkDotNet v0.13.7, Ubuntu 22.04.3 LTS (Jammy Jellyfish)
 *  Intel Xeon Platinum 8370C CPU 2.80GHz, 1 CPU, 2 logical and 2 physical cores
 *  .NET SDK 8.0.100-preview.7.23376.3
 *    [Host]     : .NET 8.0.0 (8.0.23.37506), X64 RyuJIT AVX2
 *    DefaultJob : .NET 8.0.0 (8.0.23.37506), X64 RyuJIT AVX2
 *
 *
 *  | Method |       size |      Mean |     Error |    StdDev | Ratio | Allocated | Alloc Ratio |
 *  |------- |----------- |----------:|----------:|----------:|------:|----------:|------------:|
 *  | Modulo |    2097152 | 40.179 us | 0.0344 us | 0.0287 us |  1.00 |         - |          NA |
 *  |    And |    2097152 |  7.164 us | 0.0010 us | 0.0009 us |  0.18 |         - |          NA |
 *  |        |            |           |           |           |       |           |             |
 *  | Modulo |    4194304 | 40.163 us | 0.0057 us | 0.0054 us |  1.00 |         - |          NA |
 *  |    And |    4194304 |  7.166 us | 0.0035 us | 0.0033 us |  0.18 |         - |          NA |
 *  |        |            |           |           |           |       |           |             |
 *  | Modulo |    8388608 | 40.179 us | 0.0248 us | 0.0220 us |  1.00 |         - |          NA |
 *  |    And |    8388608 |  7.164 us | 0.0014 us | 0.0011 us |  0.18 |         - |          NA |
 *  |        |            |           |           |           |       |           |             |
 *  | Modulo |   16777216 | 40.166 us | 0.0038 us | 0.0036 us |  1.00 |         - |          NA |
 *  |    And |   16777216 |  8.040 us | 0.0006 us | 0.0006 us |  0.20 |         - |          NA |
 *  |        |            |           |           |           |       |           |             |
 *  | Modulo |   33554432 | 40.166 us | 0.0054 us | 0.0046 us |  1.00 |         - |          NA |
 *  |    And |   33554432 |  7.165 us | 0.0034 us | 0.0028 us |  0.18 |         - |          NA |
 *  |        |            |           |           |           |       |           |             |
 *  | Modulo |   67108864 | 40.180 us | 0.0256 us | 0.0227 us |  1.00 |         - |          NA |
 *  |    And |   67108864 |  7.164 us | 0.0012 us | 0.0010 us |  0.18 |         - |          NA |
 *  |        |            |           |           |           |       |           |             |
 *  | Modulo |  134217728 | 40.169 us | 0.0093 us | 0.0082 us |  1.00 |         - |          NA |
 *  |    And |  134217728 |  7.169 us | 0.0015 us | 0.0013 us |  0.18 |         - |          NA |
 *  |        |            |           |           |           |       |           |             |
 *  | Modulo |  268435456 | 40.163 us | 0.0050 us | 0.0042 us |  1.00 |         - |          NA |
 *  |    And |  268435456 |  8.041 us | 0.0013 us | 0.0011 us |  0.20 |         - |          NA |
 *  |        |            |           |           |           |       |           |             |
 *  | Modulo |  536870912 | 40.159 us | 0.0037 us | 0.0031 us |  1.00 |         - |          NA |
 *  |    And |  536870912 |  7.168 us | 0.0008 us | 0.0007 us |  0.18 |         - |          NA |
 *  |        |            |           |           |           |       |           |             |
 *  | Modulo | 1073741824 | 40.167 us | 0.0137 us | 0.0114 us |  1.00 |         - |          NA |
 *  |    And | 1073741824 |  8.040 us | 0.0011 us | 0.0010 us |  0.20 |         - |          NA |