* Add native Apple ARM silicon M1/M2/M3 support
* Identify Mac ARM in download get.py script
Thanks to the ESP32 `get.py` sources!
* Rebuild M1 w/o using strip
When get.py is run in a script the percent-update printouts shown while
downloading the toolchain end up as 100s to 1000s of lines in log files.
When stdout is not a terminal, avoid printing these percentages and
shrink logfiles significantly. Errors/etc. are still reported as normal.