Add configuration to make window stay on top of other windows

[davidhemphill]

Cool app!

I would love to have the ability to keep the extended display window on top of all other windows. This would allow for making a video fullscreen on the extended display and mimicking Picture-in-Picture mode, when it's not available.

[lhotari]

Yes, this would be a useful feature for many usecase. This seems to be the only feature that I'm missing when I'm using DeskPad.