Rebase Firmware on PlatformIO 3.3.1 / ESP-IDF 4.3

[johnwalicki]

https://github.com/platformio/platform-espressif32/releases
https://github.com/espressif/esp-idf/releases/tag/v4.3

Review release notes / changelog again.
Note any potential breaking changes.
Upgrade development workstation / compile firmware / test

[johnwalicki]

Pay particular attention to changes in
.platformio/packages/framework-arduinoespressif32/libraries/WiFiClientSecure/src/ssl_client.cpp

[andygrillo]

as we are not using SSL, can we close this out ?