Successful Windows11 + CUDA 12.9 compilation with multiple source code fixes

I've compiled the package successfully on Windows 11 with CUDA 12.9 using Visual Studio 2022 Community, with either MKL or openblas, python 3.12 (due to open3D currently).

However, both the setup.py and several source files need to be fixed to get the GPU compilation passing through.

Just in case, details can be found on https://blog.csdn.net/relaxli/article/details/151964017 .
