Evaluate attack and defense status of king flanks

[TheRealGioviok]

Passed STC:

Test  | flankattdef
Elo   | 18.10 +- 6.18 (95%)
SPRT  | 8.0+0.08s Threads=1 Hash=16MB
LLR   | 3.08 (-2.94, 2.94) [0.00, 3.00]
Games | N: 4266 W: 1242 L: 1020 D: 2004
Penta | [36, 455, 973, 589, 80]

https://ob.cwchess.org/test/1323/

Passed LTC:

Test  | flankattdef
Elo   | 17.48 +- 5.89 (95%)
SPRT  | 40.0+0.40s Threads=1 Hash=64MB
LLR   | 3.01 (-2.94, 2.94) [0.00, 3.00]
Games | N: 3918 W: 1125 L: 928 D: 1865
Penta | [10, 408, 958, 541, 42]

https://ob.cwchess.org/test/1324/

Bench: 18377860