Relevant micropython commits:
d1bfb271d7686708fe8711a177629c8bf6e7f6a6 lib/uzlib: Move uzlib code from extmod to lib.
4d546713ec8858cbf908de45de11cbfc46a20971 shared: Introduce new top-level dir and move 1st party lib code there.
ca920f72184c50f61002aa9d5cd01555b1e28b7b py/mpstate: Make exceptions thread-local.
