TB support

[Ciekce]

via Pyrrhic.

Implementation is essentially ported (as with #418) from stormphrax, complete with correct multipv handling and handling for repetition edge cases.

bitboard attacks with sliders based on jw's implementation in akimbo are also included

see discussion on discord for why pyrrhic is included outright

one included TODO in uci.cpp, as SyzygyPath currently does not accept values with spaces

Test  | tb
Elo   | 16.62 +- 5.82 (95%)
SPRT  | 8.0+0.08s Threads=1 Hash=16MB
LLR   | 2.97 (-2.94, 2.94) [0.00, 3.00]
Games | N: 4226 W: 1217 L: 1015 D: 1994
Penta | [32, 404, 1063, 558, 56]

https://ob.cwchess.org/test/1551/

Test  | tb
Elo   | 18.18 +- 5.70 (95%)
SPRT  | 40.0+0.40s Threads=1 Hash=64MB
LLR   | 2.96 (-2.94, 2.94) [0.00, 3.00]
Games | N: 3366 W: 896 L: 720 D: 1750
Penta | [12, 263, 961, 431, 16]

https://ob.cwchess.org/test/1552/

(tested with TB6)

[TheRealGioviok]

lgtm, i would wait for some other eyes on this just to be sure :)