⚡ Refactor move encoding methods and stop encoding special move flags individually

[eduherminio]

Test  | perf/move-encoding
Elo   | 1.18 +- 2.93 (95%)
SPRT  | 8.0+0.08s Threads=1 Hash=32MB
LLR   | 2.90 (-2.25, 2.89) [-3.00, 1.00]
Games | N: 33574 W: 10500 L: 10386 D: 12688
Penta | [1298, 3779, 6495, 3941, 1274]
https://openbench.lynx-chess.com/test/105/

Test  | perf/move-encoding
Elo   | -0.13 +- 2.74 (95%)
SPRT  | 40.0+0.40s Threads=1 Hash=128MB
LLR   | 0.94 (-2.25, 2.89) [-3.00, 1.00]
Games | N: 34990 W: 9927 L: 9940 D: 15123
Penta | [1005, 4191, 7153, 4104, 1042]
https://openbench.lynx-chess.com/test/107/

> python.exe .\sprt.py -w 9925 -l 9933 -d 15120 -e0 -5 -e1 0
ELO: -0.0795 +- 2.74 [-2.82, 2.66]
LLR: 4.05 [-5.0, 0.0] (-2.94, 2.94)
H1 Accepted