Also optimise both `isgenerator()` and `isgeneratorfunction()` so they use
the same lambda, and don't have to create it each time they are called.
Fixes issue #997.
Signed-off-by: Damien George <damien@micropython.org>
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>