zinc tests depend on ioreg
Using new lifetime_def (fixes #132)
Merge pull request #133 from farcaller/fix-fallout

Fixed nightly fallout and dependency tracking for tests

Reviewed-by: farcaller,bharrisau
k20::{sim, pin}: Port to ioregs!
k20::uart: Port to ioregs!
ioreg::parser: Add proper support for inner doc comments
k20::pin: Use inner comments
k20::uart: Use inner comments