Texture Atlas for more optimized instancing

[kirides]

• implements a Texture atlas approach for World mesh and static VOBs

  • the world mesh is drawn with a single Multidraw dispatch, where the buffers are created once upon world loading
  • static VOBs work the same

• On Top of Atlas support:

  • completely draw Mesh and vobs using Multidraw indirect with a single texture atlas binding per texture format.
  • build a Hi-Z buffer to perform occlusion culling for VOBs using the world mesh drawn in the previous step.
  • perform frustum and distance culling on the GPU using Compute shaders.

• prepare some abstractions to ease migration to dx12 at some point in the future.

  • D3D11CommandList as a wrapper around the immediate context, not yet in use.
  • PipelineStateObject as abstraction for currently manually managed d3d11 raster states. Not yet in use, would increase PR way too much and requires a lot of refactoring. Current approach of SetDefaultStates and UpdateRenderStates is working fine, but doesn't map to dx12/Vulkan at all.

• started to reduce the weight of D3D11GraphicsEngine by moving some parts of specific renderpasses into separate classes.

• increase normalmap precision while keeping them 32bpp using octahedral encoding.

  • required HBAO+ to stop using normals as the library doesn't support encoded normals.

many more things, will update this PR description shortly.