ssl support for mqtt

[dearekaelle]

it would be great if edomoticz was supporting mqtts/tls.

enabling ssl on mqtt broker and enablig it on domoticz currently will break edomoticz connection to mqtt as it continues plaintext protocol.

if this feature was to be implemented, edomoticz should be able to grab ssl config from domoticz with mqtt:true or otherwise have a tls/mqtts protocol flag for advanced mqtt config override.