graphics: Improve handling of color buffer and storage image swizzles #1763
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Removed some color buffer component swaps that were wrong since eR8G8B8A8Unorm and eA8B8G8R8UnormPack32 are technically the same format for little-endian GPUs, which both AMD and NVIDIA are. This lets the shader specialization mechanism handle it instead.
Handle swizzles for storage image writes by swizzling incoming texel in the shader, as well as format buffer swizzles since BUFFER_LOAD_FORMAT and BUFFER_STORE_FORMAT use dst_sel from the sharp.
For storage images specifically we only perform manual swizzling if the format isn't 8_8_8_8 since those can be swizzled with image view and is already mostly handledIgnore mrtz stencil exports since those are unsupported for now