Texture Validation

[TheSpydog]

Setting up texture creation validation. This has the prerequisite of moving all texture metadata info to the container in a common header (#95) so I'm working on that incrementally.

• Move texture data to container in D3D11
• Move texture data to container in Vulkan
• Add the texture common header to D3D12
• Remove depth format fallback logic from CreateTexture
  • Document the support matrix (D16 is always available, check which of D32/D24 you have before using it)
• Add validation checks to CreateTexture
• Add validation checks to Blit

[flibitijibibo]

Looks good at the high level - @thatcosmonaut, you can squash this whenever you're ready

[thatcosmonaut]

Looks fantastic, this is a great change. Just one small typo fix needed and this can go in.