32-bit support

[InBetweenNames]

Hello, I noticed bytebox can't be built on 32-bit platforms (e.g. arm32, mips32, x86) due to some assumptions about usize. I may tackle this myself when I get some time.

[rdunnington]

I'm looking into this now, all the changes seem straightforward enough. Thanks for reporting it. You can track the progress of the changes on the branch: https://github.com/rdunnington/bytebox/tree/32bit-fixes

[rdunnington]

Sorry for the extreme delay on this. #65 should take care of building on 32-bit targets, though there are still more fixes needed to make all the tests pass - depending on your use case you may or may not have any luck getting it to work. CI builds 32-bit targets now so at least the build won't regress.