Description:

This version in now stable for EZSP, restores configuration after reboot, sends and receives commands.

It will need a little better management of the Reset GPIO, better handling of ASH Serial ACK/NAK.
All features are working except Zigbee Binding.

Checklist:

• The pull request is done against the latest dev branch
• Only relevant files were touched
• Only one feature/fix was added per PR.
• The code change is tested and works on core ESP8266 V.2.7.1
• The code change is tested and works on core ESP32 V.1.12.2
• I accept the CLA.

NOTE: The code change must pass CI tests. Your PR cannot be merged unless tests pass