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dozen: Convert to dynamic rendering

D3D12 doesn't have a concept of complicated render passes so all that render pass code is doing nothing useful. Converting a driver to dynamic rendering typically cuts around 1k LOC. All that needs to be done is:

  1. Implement vkCmdBegin/EndRendering()
  2. Delete vkCmdBegin/EndRenderPass(), vkCmdNextSubpass() and the entire dzn_render_pass and dzn_framebuffer data structures.
  3. Convert dozen meta stuff to dynamic rendering
  4. Advertise VK_KHR_dynamic_rendering. You've got it now, so why not?

It'd be way easier to make these changes now before you've built a bunch more meta stuff on top of render passes etc.

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