Allow connected device (phone, api, whatever) to reset the NodeDB

[mc-hamster]

Requested by @mkinney

Have a way to reset the NodeDB.

First set *numNodes = 0; and then subsequently call MeshService::reloadOwner().

Also need a way to trigger this from a connected device.

[karamo]

Ich used Meshtastic

set /p pn=Serial Port:
meshtastic --port %pn% --export-config >config.yml
meshtastic --port %pn% --set factory_reset true

followed by meshtastic --port %pn% --configure config.yml

[mkinney]

Doing a factory_reset is definitely an option, but there might (should be?) a more precise way.

Interesting use of setting the pn variable. :-)

[mkinney]

I transferred this issue to -python because I thought it might make sense to implement it in this client first. (But, that may not have been the smartest idea because I don't know if that method is exposed in -device.)

[garthvh]

What about this requires protos?

[sachaw]

Protobufs implemented

[andrekir]

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