Command BrRestart to restart the Berry VM (experimental)

[s-hadinger]

Description:

The command BrRestart deletes the current Berry Virtual Machine and creates a new one, and initalize it (including loading of autoexec.be).

This is an experimental feature only useful for Berry developers, and facilitates testing without waiting for a full Tasmota restart.

Limitations: unfortunately Arduino is not able to deregister Request Handlers in the local web server. So restarting the Berry VM breaks all WebUI implemented in Berry (webser.on()). I don't see any way to solve this for now.

If #define USE_BERRY_DEBUG is defined, a new "Restart Berry VM" button is added to the Berry console:

Checklist:

• The pull request is done against the latest development branch
• Only relevant files were touched
• Only one feature/fix was added per PR and the code change compiles without warnings
• The code change is tested and works with Tasmota core ESP8266 V.2.7.4.9
• The code change is tested and works with Tasmota core ESP32 V.2.0.10
• I accept the CLA.

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

[btsimonh]

multiple times when testing berry code, I've found that it does not work after a restart because I'd forgotten about some global variable I'd made earlier, and that the module under test depended on.... so i'd find this useful.