SPDX standardizes how source code conveys its copyright and licensing
information. See https://spdx.github.io/spdx-spec/1-rationale/ . SPDX
tags are adopted in many large projects, including things like the Linux
kernel.

-Reworked thread waits to never hang the Host thread for more than a really small time
(e.g. when disabling DSU its thread now closes almost immediately)
-Improve robustness when a large amount of devices are connected
-Add devices disconnection detection (they'd stay there forever until manually refreshed)

where appropriate. SerialInterface was a leftover from the past,
and makes no sense to be used on actual/real controllers.

Continues the migration of the logging calls over to the fmt capable
ones.

Provides the same semantics of a C array, but is much nicer to work
with.

Notably, it makes all cases of performing comparisons with said arrays
significantly less reading-involved.

Prevents potential inclusion issues from occurring.