An upsetting 2223 lines of code, but so much great stuff!

• 7 backends : CLANG, CPU, CUDA, GPU, LLVM, METAL, and TORCH
• A TinyJit for speed (decorate your GPU function today)
• Support for a lot of onnx, including all the models in the backend tests
• No more MLOP convs, all HLOP (autodiff for convs)
• Improvements to shapetracker and symbolic engine
• 15% faster at running the openpilot model