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Also switches to BRAM for data, because why not.
Makes it Rust 1.83 compatible
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Add some helper functions for checking stack usage, and add stack usage reports to the examples. I also took the opportunity to massively reduce the stack sizes, now we know exactly how much space we need.
The report goes to stderr because it may change as Rust versions change, and so we don't want it to appear in the reference outputs.
This relies on QEMU initialising RAM with 0x0, which it does. Users on real hardware would need to paint their stack for this to work.