Remove non-CircuitPython ports

[dhalbert]

Remove non-CircuitPython ports. We discussed this a week or two ago in the weekly CircuitPython meeting, and there was general agreement to remove these for clarity. These ports have not kept up with CircuitPython, except for esp8266, which was dropped. If and when we do a port to one of these platforms, we may choose a different directory name so as not to conflict with the MicroPython port name. (For example, we are using stm32f4 for our port, instead of stm32.)

These ports have been removed. Each is in one commit, so it may be reverted easily, for whatever reason.

• bare-arm
• cc3200
• esp32
• esp8266
• minimal
• pic16bit
• qemu-arm
• stm32
• teensy
• windows
• zephyr

These ports remain:

• atmel-samd
• nrf
• stm32f4
• unix

Further work in this direction will bring the unix port closer to CircuitPython, such as removing dependencies on extmod in favor of shared-*.

[tannewt]

Looks good to me! Needs one merge before merge.

[arturo182]

I believe there are submodules that are used only by the ports being removed so they could be removed too, for example "lib/stm32lib" and "lib/berkeley-db-1.xx".

[arturo182]

Does this also mean some of the old code only used by those ports will be removed too, like the machine modules?

[tannewt]

Thanks! Feel free to merge after GitHub CI is happy.

[dhalbert]

@arturo182 extmod, which includes machine, will go away later, after i updated the remaining ports, including the unix port, to not use anything in extmod. We need to move various things in extmod like re and json to shared-*. I can clean up the submodules at that time as well; thanks for pointing those out.

[arturo182]

Sounds good to me. Nice to see CP dropping dead and unsupported code :)

[dhalbert]

@tannewt, OK, finally built correctly again.

[tannewt]

Great! Thanks!