move declarations to separate file

[naturallymitchell]

https://github.com/foundpatterns/torchbear/blob/fdb47a2150261c1869b39e364a90ac60d70f6d3f/src/lib.rs#L2-L48

would it be possible to move extern crate declarations to declarations.rs or better? we should be able to Split a module across several files , right?

[dariusc93]

For now they can stay as is since moving them wont really solve anything and would likely break stuff. I do plan on moving torchbear to 2018 edition which would allow us to remove extern crate for the majority of them, though there is really no gain or loss from switching

[dariusc93]

With a switch to 2018 edition (https://github.com/foundpatterns/torchbear/issues/154), the extern crate will be optional unless a macro is going to be used then it would need to be included.

[naturallymitchell]

I'd still like to split lib.rs into organized submodules