V3.5 Roundup release ; last chance for Face Detection

[easytarget]

V3.5 Roundup release that brings in a few key fixes from 4.x:

• xclock setting in myconfig.h, improves running on budget modules with bus issues.
• Show MCU temperature
• Support ArduCAM_ESP32S_UNO
• Improved display and logging of critical errors
• A few spelling and log tweaks.

I now ONLY support the esp-arduino-core v1.0.6 for the 3.x branch. And document how to downgrade/use this in the Release notes install instructions. It mat run with v2.0.0/1 (but definitely; not with v2.0.2, the current IDE core version as of this release.)

I intend this to be the last 3.x release, there is nothing really to add any more.

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