Ray tracing support

[Purdze]

Add optional Vulkan ray tracing via VK_KHR_ray_tracing_pipeline for RTX-capable GPUs. Feature-detect hardware support and offer as a toggle in video settings. Falls back to rasterization on unsupported hardware.

[unschlagbar]

My intel integrated gpu supports vulkan raytracing pipeline😎

[Purdze]

My intel integrated gpu supports vulkan raytracing pipeline😎

You'll be the first to test it then ;)