serial: Replace the serial-rs crate with serialport-rs

[qrasmont]

Replace the unmaintained serial-rs crate with serialport-rs.
Closes #86

[eldruin]

Thank you!
Could you add the libudev-dev package here and also add an entry to the changelog?

[qrasmont]

Thank you! Could you add the libudev-dev package here and also add an entry to the changelog?

I chose to remove the dependency to libudev-sys (by disabling default features for the serialport-rs crate) because cross compilation would rely on a pkg-config config with a sysroot for the target (see readme) which complicates the setup for CI and usage.
Especially since as described here, the impact of disabling this dependency sums up as : "Enumeration will still be available [...], but won't expose as much information and may return ports that don't exist physically."

This would not be necessary if this PR got merged into libudev-sys: dcuddeback/libudev-sys#8

[eldruin]

Great solution. Thank you for looking into it.
Sadly libudev-sys seems abandoned, but great to know that it is not really necessary.

[eldruin]

Looks good to me, thank you for your work!
bors r+

[bors]

Build succeeded:

• CI (1.54.0, x86_64-unknown-linux-gnu)
• CI (stable, armv7-unknown-linux-gnueabihf)
• CI (stable, x86_64-unknown-linux-gnu)