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Chess engine: Lc0 0.29.0-rc0 (Windows and Android)

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new v.0.29.0-rc0:
Initial support for attention policy, only cuda backend and partially in
blas/dnnl/eigen (good enough for T79).
Non multigather (legacy) search code and --multigather option are removed.
15b default net is now 753723.
The onnx backend now allows selecting gpu to use.
Improved error messages for unsupported network files.
Some assorted fixes.

Rating JCER=3325

Lc0 0.29.0-rc0 download

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