Add C++ wrapper Simd::SynetDeconvolution16b

[ermig1979]

Summary

Add Simd::SynetDeconvolution16b, a C++ wrapper analogue of Synet::Deconvolution16b from ermig1979/Synet (src/Synet/Utils/Deconvolution.h on dev).

The class lives in SimdSynet.hpp and wraps:

• SimdSynetDeconvolution16bInit
• SimdSynetDeconvolution16bExternalBufferSize
• SimdSynetDeconvolution16bInternalBufferSize
• SimdSynetDeconvolution16bInfo
• SimdSynetDeconvolution16bSetParams
• SimdSynetDeconvolution16bForward

It follows the existing Simd::SynetDeconvolution32f wrapper style: Init / Enable / buffer-size / Info / SetParams / Forward / Clear, with Doxygen documentation and a usage example.

Test

• TestSynetDeconvolution16b() in src/Test/TestCheckCpp.cpp compares the wrapper against the C API on a small NHWC 2x2 deconvolution (output values, internal/external buffer sizes, and Info()).
• Verified locally:
  • ./Test "-r=.." -cc=1 -fi=SobelDx -tt=1 -ts=1 — CheckCpp wrapper test plus Sobel smoke, no failures
  • Standalone wrapper vs C API: Enable, buffer sizes 11528/9216 (FP32) and 12104/9792 (BF16), Info AmxBf16::NhwcGemm, 144 outputs match
  • ./Test "-r=.." -fi=SynetDeconvolution16b -tt=1 -ts=1 — C API auto-tests passed

Docs

• Doxygen class description in SimdSynet.hpp
• C++ wrapper notes on the C API functions in SimdLib.h
• cpp_synet group mention in prj/txt/DoxygenGroups.txt
• Release 7.2.165 notes in docs/2026.html

SimdSynet.hpp was already listed in prj/vs2022/Simd.vcxproj and prj/vs2022/Simd.vcxproj.filters; no VS project change was required.

Notes

Sources were taken from the dev branches of both Simd and Synet.