⚡ Refactor Update50movesRule() method

[eduherminio]

• Move Utils.Update50movesRule to Game, since it updates the 50 moves counter there
• Increase bench depth to 8
• Add two more fens to bench that involve triple repetition and 50 moves draw

8+0.08, [-5, 0]

Score of Lynx-refactor-update50movesrule-2685-win-x64 vs Lynx 2680 - main: 2485 - 2419 - 3100  [0.504] 8004
...      Lynx-refactor-update50movesrule-2685-win-x64 playing White: 1716 - 751 - 1536  [0.621] 4003
...      Lynx-refactor-update50movesrule-2685-win-x64 playing Black: 769 - 1668 - 1564  [0.388] 4001
...      White vs Black: 3384 - 1520 - 3100  [0.616] 8004
Elo difference: 2.9 +/- 6.0, LOS: 82.7 %, DrawRatio: 38.7 %
SPRT: llr 2.9 (100.4%), lbound -2.25, ubound 2.89 - H1 was accepted