Close to the new limit of 5000 lines at 4981.

Release Highlights

• Real dtype support within kernels!
• New .schedule() API to separate concerns of scheduling and running
• New lazy.py implementation doesn't reorder at build time. GRAPH=1 is usable to debug issues
• 95 TFLOP FP16->FP32 matmuls on 7900XTX
• GPT2 runs (jitted) in 2 ms on NVIDIA 3090
• Powerful and fast kernel beam search with BEAM=2
• GPU/CUDA/HIP backends switched to gpuctypes
• New (alpha) multigpu sharding API with .shard

See the full changelog: https://github.com/tinygrad/tinygrad/compare/v0.7.0...v0.8.0

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