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.
Avoids dragging in IniFile, EXI device and SI device headers in this header which is
quite widely used throughout the codebase.
This also uncovered a few cases where indirect inclusions were being
relied upon, which this also fixes.
Deduplicates code, and gets rid of some problems the old code had
(such as: bad performance when calling native functions, only one
disc showing up for multi-disc games, Wii banners being low-res,
unnecessarily much effort being needed for adding more metadata).
Places all of the SI code under the SerialInterface namespace instead of
only the main source file. This keeps all SI code under a common name,
as well as out of the global namespace
Under failure conditions of the GC Adapter, When interface count is zero and we can't open the device.
Then there were race conditions on shutdown of the threads which could result in crashing.
Make adapter opening more robust like the Mayflash DolphinBar.
Make shutdown more robust by making the read thread control the write thread.
Make sure that there is actual data to be written when kicking the write thread. So it doesn't attempt a write a shutdown.
Make a toast on screen to tell the user that the adapter needs to be unplugged and plugged back in again for it to work.
No way to properly enable it from an end user perspective yet.
Doesn't require root.
This same sort of system can be used for the Dolphinbar in the future for real wiimote support.
