Add a pan function to the zoom function of the image

[deoostfrees]

[midzer]

I got this functionality implemented in https://github.com/midzer/tobii/releases/tag/v2.6.0

Feel free to copy relevant parts :)

Have a nice weekend
midzer

[deoostfrees]

Ah, Tobii. Good old memories. Thank you, I'll take a look at it.