Add support for all format specifiers, support for `datefmt` using
(optional) strftime, and support for Stream and File handlers.
Ports/boards that need to use `FileHandlers` should enable
`MICROPY_PY_SYS_ATEXIT`, and enabled `MICROPY_PY_SYS_EXC_INFO` if using
`logging.exception()`.
Uses the new require()/package()/module() functions from manifestfile.py.
Add manifest.py for iperf3 and pyjwt.
Signed-off-by: Jim Mussared <jim.mussared@gmail.com>
Jared Hancock