Trevor Gross bec94a33d5 dec2flt: Move internal traits to better locations
`Float` and `FloatExt` are already used by both parsing and printing, so
move them out of `dec2flt` to a new module in `num::imp`. `Int` `Cast`
have the potential to be used more places in the future, so move them
there as well. `Lemire` is the only remaining trait; since it is small,
move it into the `dec2flt` root.

The `fmt::LowerExp` bound is removed from `Float` here since the trait
is moving into a module without `#[cfg(not(no_fp_fmt_parse))]` and it
isn't implemented with that config (it's not easily possible to add
`cfg` attributes to a single supertrait, unfortunately). This isn't a
problem since it isn't actually being used.
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