Windows Python doesn't seem to kill the worker Thread properly when the IDE
is exited, leading to a) multiple Python3 instances on a PC after many uses
and b) errors updating the core when it tries to re-install Python3 while
still having the older version's EXE loaded and in use.
When an exception happens on the input() call under Windows, it seems like it
can still leave a thread running. Add one more flag, caught in a global
exception handler.
Works around https://github.com/arduino/arduino-cli/issues/2867
When receiving a `QUIT` message, the main thread was trying to tell
the scanner thread to quit - however, what it was actually doing was
creating a local variable that shadowed the global flag used by the
scanner thread. Fix that by ensuring that the main thread uses the
global variable instead.
Fixes#1028
Allow the IDE to detect UF2 volumes (i.e. when you hold BOOTDEL and
plug in the board).
Allows the IDE2 to properly upload using OTA and serial.
Fixes#890 and others
