Last Python2 release

[josephernest]

@mojca I suggest we make a last Python2 ISO release to make sure everything works for people still using this good old version, and then we can move 100% to Python3 version. Todo:

• check the test at the end of https://github.com/josephernest/SamplerBox/issues/49#issue-1332352471
• if it is confirmed working without this 38400 hack, we remove these things from https://github.com/josephernest/SamplerBox/blob/master/isoimage/root/boot/cmdline.txt and https://github.com/josephernest/SamplerBox/blob/master/isoimage/root/boot/config.txt and the main .py file
• we might simplify https://github.com/josephernest/SamplerBox/blob/master/README.md?plain=1#L22 and https://github.com/josephernest/SamplerBox/blob/master/isoimage/maker.sh#L20, for example: isn't python-pip now included out-of-the-box on a RaspiOS Lite like 2021-05-07-raspios-buster-armhf-lite.img?
• once all these things are checked, I would be interested to see if someone else than me achieves to build an ISO with this: https://github.com/josephernest/SamplerBox/blob/master/isoimage/maker.sh
• if everything is working, we freeze this last Python2 release here https://github.com/josephernest/SamplerBox/releases

Then we can add features in python3 branch and after some time, make this branch the default one.

[mojca]

Creating another release before further changes sounds perfectly ok.

But just to clarify: my patches should remain compatible with python 2.7, it's just a matter of picking the python version that gets used by default with your image. The version of python may, but it's not required to be changed immediately.

[josephernest]

I'm finally rewriting certain parts to include Python3 support directly. I hope to push these next days.