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Require bitflags >= 1.0.4

See merge request !83

Rust 2018 style macro imports aren't supported by earlier versions of
bitflags. Without this some builds would fail unless `cargo update`
was run first.

USB port detection through udev: prefer ID_*_FROM_DATABASE strings

See merge request !86

For "manufacturer" and "product" info, use ID_VENDOR_FROM_DATABASE and
ID_MODEL_FROM_DATABASE respectively, instead of ID_VENDOR / ID_MODEL.
When those strings are not available (e.g. due to old udev version),
fall back to the simple version.

This mirrors the behavior of other tools, such as `lsusb`.

Add try_clone_native()

Closes #73

See merge request !85

Replace C-style struct constructors with builder pattern

Closes #64

See merge request !73

Use nightly Clippy and rustfmt. And have Clippy run on code for all
targets and all features.

Add minimal crate version testing

See merge request !84

Remove the prelude

See merge request !82

serialport is too simple of a library with a flat hierarchy that the
prelude seems unnecessary, so I'm removing it. Either import types
explicitly or replace with `use serialport::*`.

Doable now since serialport is a Rust2018 project.

Also reorganized imports to a std, 3rd-party, 1st-party organization
that seems to be a best practice.

Refactor code organization

See merge request !81

There are really only two supported targets: ones that build and test in CI
and those that are only built in CI. With 1.42 Rust dropped support for 32-bit
Apple targets. And this list wasn't accurate with what was being done in CI.
So this commit reconciles this.

These aren't well supported by Rust anymore and should have a tiny userbase, so this
shouldn't have much impact

There is only 1 element on Windows and 2 on POSIX, so it doesn't make sense to
expose these submodules to users.

Not certain if I actually prefer this, but it was inconsistent before and so
I just went with this preference.

This changes no functionality but makes reading the code for enumeration or port creation a little
easier to read.

Expose more errors to users

Closes #69

See merge request !80

Accessing ports that are disconnected can result in ENOENT errors. Additionally,
if the user doesn't have permissions to open a port, EACCES can be triggered. These
were previously exposed as Unknown errors, which made it harder to give downstream
users good error messages, so explicitly expose these.