Auto-save images

[tmabell]

I may easily have missed this if it was discussed previously but I would like to see an addition to the app that would allow the user to save the images to disk. My vision has two parts. One option to "quick save" would be a button in the GUI. The second would be an "auto-save on update" function in Settings along with a user defined path on where to save it. When enabled, the app would save the selected view every time a new image arrives.

[dpaulat]

On-demand captures have been discussed (#414), but not auto-save. This has been a lower priority compared to other functionality, because applications like ShareX provide easy screenshot and recording capabilities.