When loading SDL2 with pkg-config the -mwindows flag is added, which
instructs the loader to load the program through WinMain() and not
create a console for it. This is intended for GUI programs. However,
fxlink is a CLI program with just occasionally an SDL window on top of
it. Disable -mwindows to keep the console and terminal output. I don't
know how to do that with the pkg-config CMake module, so use the SDL2
module for the Windows build instead.
There is no direct replacement for poll() in the Windows API, so I'm
gonna disable the fxlink TUI for now and maybe later figure out how to
do something equivalent, even if more brute-forcey.
This commit rewrites the entire device management layer of fxlink on the
libusb side, providing new abstractions that support live/async device
management, including communication.
This system is put to use in a new TUI interactive mode (fxlink -t)
which can run in the background, connects to calculators automatically
without interfering with file transfer tools, and is much more detailed
in its interface than the previous interactive mode (fxlink -i).
The TUI mode will also soon be extended to support sending data.
