v4.1: Intel Westmere Kernels

Thanks to @Algunenano and the broader ClickHouse team for help, back-porting StringZilla kernels to older CPUs 🤗
With this release:

• Substring search and hashing on CPUs from Westmere to Haswell will become at least 2x faster.
• Inferring Skylake capabilities in dynamic dispatch won't require VAES extensions only needed for Ice Lake and newer.
• MSVC will correctly detect Haswell, Ice Lake, and NEON capabilities for compile-time dispatch, lacking options to differentiate other platforms from macros.

Minor

• Add: Nehalem (SSE4.2) CPU support (#247) (2c58385)

Patch

• Fix: Checking for SSE and AES in MSVC (f7d95ad)
• Docs: More links & GPU mentions (04d6ae3)
• Improve: Reuse AES-NI since Westmere (a3b7cd5)
• Fix: Replace Nehalem with Westmere (#249) (fe30683)
• Fix: VAES debuted in Ice Lake (8cef111)