Reintroduce static evaluation based NMP reduction
Modification of #6963, which was reverted due to poor matetrack performance. This patch uses a stricter beta margin to prevent mate finding issues when beta is in decisive range
Passed STC:
LLR: 2.95 (-2.94,2.94) <0.00,2.00>
Total: 206720 W: 53724 L: 53166 D: 99830
Ptnml(0-2): 491, 23993, 53815, 24589, 472
https://tests.stockfishchess.org/tests/view/6a54efa65529b8472df808e1
Passed LTC:
LLR: 2.94 (-2.94,2.94) <0.50,2.50>
Total: 106344 W: 27926 L: 27472 D: 50946
Ptnml(0-2): 44, 11265, 30084, 11751, 28
https://tests.stockfishchess.org/tests/view/6a5a3d2c5529b8472df81249
closes https://github.com/official-stockfish/Stockfish/pull/6995
Bench: 3184328