Adding TLS to MQTT server

[nufke]

implementation for #1379

Support TLS for MQTT ports and websocket ports. This capability is required to support secure MQTT communication to enable the use of a Progressive Web App (PWA).

This PR also includes updates to the underlying infrastructure to make new certificates for mosquitto (part of update_v3.0.0.7.pl)

PR has been tested successfully using DietPi + LoxBerry on virtualboxVM using v3.0.06.

[Noschvie]

Hello
Which type of certificates are created for the MQTT server, key type RSA or ECDSA?
Thanks!

[nufke]

Default openssl configuration is used, which creates a 2048 bit RSA key. Any specific reason why we need to consider something different?

[Noschvie]

For Tasmota key type RSA is needed.

[nufke]

OK we keep RSA keys then. Note that we sign the MQTT certificates using the existing LoxBerry CA certificates. This means your client device(s) need(s) to have access to a local copy of the CA certificate. So depending on the client, you need to either install the LoxBerry CA certificate or make sure the tool is aware of the CA certificate.

[nufke]

See also #1469

NOTE: This PR does not change Loxberry versions in general..json.default yet, which means that the update file update_v3.0.0.7.pl is not called at the end of an update procedure, I've tested locally with a LoxBerry VM on Bullseye on v3.0.0.6, and the update script is working as expected at my end. Also a fresh install using the Loxberry_Installer script should work (here the relevant system updates are already managed by the installer script)