in recent circuitpython builds, `ubinascii` is available as
`binascii`. This modifies `modules/inisetup.py` to use the same
import semantics as `modules/websocket_helper.py`: first try importing
`ubinascii`, and if that fails, fall back to importing `binascii`.
Closesadafruit/circuitpython#795
This is to keep the top-level directory clean, to make it clear what is
core and what is a port, and to allow the repository to grow with new ports
in a sustainable way.