64Bit support for macOS Catalina

We need full 64bit support for macOS Catalina. In the moment there are some error messages.

Resolved in

It seems there is an update for avrdude necessary.
I get following message, sorry in german but it is the standard message for end
of 32bit support.

Resolved in

Please re-test with pio update.

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It seems it works after update and restart my mac (using Mojave).

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