[FEAT] X & Y Renderer Offset for even number of screens (2)

[hexxone]

When stretching the Wallpaper across exactly two screens, the Rendering "POV" will always be in the center of the two screens.
Even though you might want to keep the "POV" Center on your main screen and only "extend" the rendering to the 2nd screen.

Describe the solution you'd like
X & Y offset sliders [-100, +100] (%) of the screen space.
Should offset the POV of the renderer itself, not only the camera

Describe alternatives you've considered
Disabling Parallax Checkbox, the Problem is: the FOV will still start on the middle of the whole screen space.

Additional context
Initial request from "PIKLE" on Steam, thanks 👍

Will be implemented when there is some spare time :)
Feel free to open a PR.