Implement a texel tuner and use it to tune the current eval params

This tuner borrows heavily from
https://github.com/GediminasMasaitis/texel-tuner, which was used for
tuning the existing evaluation parameters.

There was, however, a bug with my implementation which caused mobility
scores to be computed incorrectly, due to not considering board
orientation for blockers. As a result, tuning, even with the same
implementation, results in a fairly sizeable Elo gain.

Elo   | 28.53 +- 11.44 (95%)
SPRT  | 8.0+0.08s Threads=1 Hash=16MB
LLR   | 2.95 (-2.94, 2.94) [0.00, 5.00]
Games | N: 2014 W: 712 L: 547 D: 755
Penta | [54, 218, 356, 267, 112]

CHANGELOG.md

@@ -4,6 +4,7 @@
 
 * Tune all evaluation parameters with https://github.com/GediminasMasaitis/texel-tuner (53.17 +- 16.76)
 * Evaluate piece mobility (41.36 +- 13.82)
+* Add a texel tuner in-repo and tune, resolving an issue where mobility scores were not computed correctly (28.53 +- 11.44)
 
 ### Misc
 

Cargo.toml

@@ -5,7 +5,7 @@ edition = "2021"
 rust-version = "1.83"
 
 [features]
-default = ["dep:clap"]
+default = ["dep:clap", "dep:rayon", "dep:indicatif"]
 release = []
 
 [build-dependencies]
@@ -15,8 +15,10 @@ cc = "1.2.2"
 arrayvec = "0.7.6"
 clap = { version = "4.5.21", features = ["derive"], optional = true }
 colored = "2.1.0"
+indicatif = { version = "0.17.9", optional = true }
 nom = "7.1.1"
 rand = "0.8.5"
+rayon = { version = "1.8.1", optional = true }
 
 [dev-dependencies]
 paste = "1.0.15"

src/chess/bitboard.rs

@@ -162,6 +162,11 @@ impl Bitboard {
         // If we go west and land on H, we wrapped around.
         Self(self.0 << 7) & Self::NOT_H_FILE
     }
+
+    #[inline(always)]
+    pub fn flip_vertically(self) -> Self {
+        Self(u64::swap_bytes(self.0))
+    }
 }
 
 pub struct SquareIterator(Bitboard);