Rename Adafruit mode to CircuitPython mode (Issue #835)

[bwshockley]

Some additional changes required to complete #835.

[ntoll]

I'll try getting this reviewed (and hopefully merged) over the weekend. Thanks!

Did you run the test suite..?

make check

Is what you need to do ;-)

[bwshockley]

I got 2 warnings:
c:\users\shockleyb\appdata\local\programs\python\python37\lib\site-packages\parso\python\tree.py:46
c:\users\shockleyb\appdata\local\programs\python\python37\lib\site-packages\parso\python\tree.py:46: DeprecationWarning: Using or importing the ABCs from 'collections' instead of
from 'collections.abc' is deprecated, and in 3.8 it will stop working
from collections import Mapping

tests/interface/test_panes.py::test_JupyterREPLPane_init
c:\users\shockleyb\appdata\local\programs\python\python37\lib\site-packages\qtconsole\jupyter_widget.py:561: DeprecationWarning: JupyterREPLPane._style_sheet_changed is deprecated in traitlets 4.1: use @observe and @unobserve instead.
def _style_sheet_changed(self):

[dhalbert]

Thank you for doing this -- it looks good! We like your choice of image for the mode as well 😃

[carlosperate]

Thanks for the submission @bwshockley!
I hope you don't mind I've changed the PR title for something a bit more descriptive.
I've also added a couple of comments to the PR, but they are very minor things.

[ntoll]

@bwshockley thank you for doing this..! This is great to see... :-) I had to fix a couple of merge conflicts but it all looks good. It'll be in the upcoming alpha2 release.