AclUnity | Unity Native Plugin for ACL

Disclaimer: I am not very good with DevOps and am pretty happy I even got this project this far. Adding support for a new platform should not require any C++ code changes. Instead, you will need to modify the top-level CMakeLists.txt to detect your target platform and specify the correct compiler flags for the different supported CPU architectures. The current CMakeLists.txt assumes your target platform is the same device that you are compiling for (either Windows or Linux). Once you have successfully compiled the library, import it into Unity as a native plugin. Depending on your target platform, you may need to modify the Kinemation/ACL_Unity C# files to load the correct version of the compiled library plugin for a given architecture. Note that when Burst is disabled, the code will always use the base version of the plugin with no extra CPU features. Lastly, if your target platform is not constrained by NDA, you can support it in GitHub actions by modifying .github/workflows/acl-cross-platform-build.yml and adding a dedicated job with your platform. Every time you push changes, the jobs will run and you will be able to download and inspect artifacts. Test the artifacts to ensure they work correctly. Then create a pull request.