Platform toolset143 compatibility

[dimensional-difficulties]

Fixing compatibility issue with Visual C++ version 143. Updating shaders to match those in https://github.com/microsoft/DirectX-Graphics-Samples/tree/master/MiniEngine/Core/Shaders, and updating project files as required.

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[coopp]

Looks good to me.

[Zu-shi]

Submitted some requested changes & comments

[Zu-shi]

Should this be gs_ClosestDepthSearch?

[Zu-shi]

(specifically, the first gs_FarthestDepthSearch on this line)

[Zu-shi]

I'm not very familiar with this method - what caused the need to add saturate?

[Zu-shi]

also small nit: spacing

[Zu-shi]

Hmm... it would be helpful to have a description in the PR for the reasoning of change in this method. Should this be setting [GI] instead of [i]?