Implement rounding for the hex float parsing and prepare to improve error handling

Parsing errors are now bubbled up part of the way, but that needs some
more work.

Rounding should be correct, and the `Status` returned by `parse_any`
should have the correct bits set. These are used for the current (unchanged)
behavior of the surface level functions like `hf64`: panic on invalid inputs, or
values that aren't exactly representable.

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