Official Stockfish pre-release: Stockfish dev-20260318

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Official prerelease Stockfish dev-20260318
Rating Chess Engines Diary CEDR=3755.52

Great news for chess enthusiasts! 
The pre-release version of Stockfish dev-20260318, widely recognized as the world's top chess engine, has been released. This brings us one step closer to the next official release. Our team is excited to begin testing it today, and we'll be sure to share the results on our website. Stay tuned!

What changes in the new Stockfish dev-20260318 version?

Speedup splat_moves on avx512icl

STC
```
LLR: 5.45 (-2.94,2.94) <0.00,2.00>
Total: 612192 W: 158602 L: 157260 D: 296330
Ptnml(0-2): 1634, 67783, 166027, 68911, 1741
```

@Torom measured:
```
sf_base =  2380902 +/-   1016 (95%)
sf_test =  2391426 +/-   1065 (95%)
diff    =    10524 +/-   1336 (95%)
speedup = 0.44203% +/- 0.056% (95%)
```

I've verified that `_mm512_slli_epi16(v, 0)` gets optimized out in GCC
9+ and clang 4+. Added constants to types.h so that people messing
around with the layout of `Move` don't have to know about this part of
the code.

closes https://github.com/official-stockfish/Stockfish/pull/6670
No functional change

Stockfish dev-20260118 download (all files: stockfish-windows-armv8.exe
stockfish-windows-armv8-dotprod.exe
stockfish-windows-x86-64.exe
stockfish-windows-x86-64-avx2.exe
stockfish-windows-x86-64-avx512.exe
stockfish-windows-x86-64-avx512icl.exe
stockfish-windows-x86-64-avxvnni.exe
stockfish-windows-x86-64-bmi2.exe
stockfish-windows-x86-64-sse41-popcnt.exe
stockfish-windows-x86-64-vnni512.exe )  


Here are some sample tournament wins for the Stockfish engine on Android and Windows::



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