New plugin pimatic-xmpp

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@kosta Thanks for the update (and the plugin of course). I got rid of forementioned ButtonsDevice and made a new one. Everything is working well now

@fregger you’re welcome. Nice to hear it’s working.

@kosta Just wondering, would it be possible to attach a picture to a message?

@fregger XMPP is not designed to transport binary data. The library used does not provide such feature.
Therefore, an implementation becomes difficult.