Firmware BMP with ENABLE_DEBUG=1 will print WARN and INFO as before.
PC-Hosted BMPwill alway print to stderr. Warn is printed unconditional,
INFO, GDB, TARGET, DONGLE and WIRE will print if their appropriate bit in
cl_debuglevel is set via the -v verbose command line argument.
INFO will go to stdout with -t or -l.
- If host provided /dev/serial/by-id, device must not be given and
multiple devices may be selected with -s <(partial) serial number>
- On windows, device must by specifies with -d
