Copy Settings about filmulator-gui

[CarVac]

In the queue right-click menu:

1. Copy all settings
2. Copy some settings... (only for current image)
3. Paste settings (only when they're there to paste)

'Copy some settings' should gray out all the sliders, and change the reset button into a checkbox.

When you paste them, it re-enables all the sliders.

When you move a slider, it erases all the copied settings, so that you won't accidentally copy over other images.

[JohannesNE]

On 0.11.1, Linux, I have to copy again after every paste. I would prefer the settings staying in the clipboard until overwrite.

Edit: Should have read the documentation first: https://github.com/CarVac/filmulator-gui/wiki/Basic-guide-to-the-User-Interface#queue