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StereoscopicView

! Press 'Left Ctrl' + 'T' to toggle between normal and stereoscopic view.

How it works: (updated 10 aug 2019)
Main camera is cloned and set at a certain distance and as a child to the main camera.
Move controls are disabled for the cloned camera.
From there it depends on the settings.

Settings: (updated 12 aug 2019)
-Turn on width scaling
Without scaling each camera is set to one half of the screen.
With scaling each camera is projecting to an image wich is squeezed to one half of the screen.
With scaling the image appears darker and draws over the UI; no proper solution found yet.
-Turn off borked effects
Effects that do not work properly on both halves are turned off.
Such effects include: 'OverlayEffect','TiltShiftEffect','FadeEffect','FilmGrainEffect'.
-Turn off color correction
I had a feeling, when selecting none in the options, color correction was never really off;
happens to be the way I like it.
Only works during stereoscopic view.

Other issues:
Mousepointer is borked,
UI is not in stereo,
Undergroundview is weird.
No light reflection from streets and buildings during night.

Somewhere in the future plans:
The bug that itches me the most is the darkness at night.
Getting the 'OverlayEffect' working would be awesome but for now I have no clue how to do.
When the overlayeffect is done undergroundview is easy...I hope.
UI in visualised in stereo is one thing; getting it working in stereo is something else.

Tip: if you have a VR headset; there is free software available (BigscreenVR) that transforms your split screen into 3D.

My mods are published with code.
If you have more time and skills than me...please steal and improve!