Add SDKs.props that controls which version of OptiX and Cuda SKDs are used through OPTIX_USE_VER (x.x.x) and CUDA_USE_VER (x.x) environment variables
Fix SKDs.props import condition. Remove redefinition inherited dependency libs (kernel32.lib etc..)
Use CudaToolkitIncludeDir, CudaToolkitLibDir, CudaToolkitBinDir variables instead of manually deriving paths
To upper case optix version env variable name
VS insists on making a change (no visible change)
Merge project cleanup from branch 'master' into CotextInitTest

Conflicts:
	RenderEngine/RenderEngine.vcxproj
Build Context test project by default (solution build)
Use CUDA_USE_VER env variable to import BuildCustomization files for given Cuda version
Use OptixBinDir variable defined in SDKs.props for dependency copying
Update readme.md
Update readme.md
Update readme.md
Merge branch 'master' into CotextInitTest
Merge branch 'CotextInitTest' of https://github.com/voldemarz/OppositeRenderer into CotextInitTest