Move most uses of the std crate to core and alloc #196
      
        
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std::ioandstd::error::Errorare the two remaining uses ofstdpreventing this crate from building in a#![no_std]context.I’ve tried reimplementing just these parts of
stdin this crate, but it was obviously not a good way forward, and I don’t know what could be a way forward here. In the meantime, these changes don’t cause any issue, and will be useful for the next person trying to implementno_std!f32::ceil()andf32::fract()are two other functions we use which are available only instd, I’m not too sure why.