🔍 Regular search: Fail hard -> fail soft

Implement fail-soft
Rename search result from evaluation to score, following standard naming conventions

[0, 5];

Score of Lynx-search-failsoft-1-4017-win-x64 vs Lynx 4008 - main: 783 - 655 - 1207  [0.524] 2645
...      Lynx-search-failsoft-1-4017-win-x64 playing White: 577 - 154 - 592  [0.660] 1323
...      Lynx-search-failsoft-1-4017-win-x64 playing Black: 206 - 501 - 615  [0.388] 1322
...      White vs Black: 1078 - 360 - 1207  [0.636] 2645
Elo difference: 16.8 +/- 9.8, LOS: 100.0 %, DrawRatio: 45.6 %
SPRT: llr 2.89 (100.0%), lbound -2.25, ubound 2.89 - H1 was accepted

lynx-chess / Lynx

🔍 Regular search: Fail hard -> fail soft #1039