vk: Use VK_FORMAT_R8G8B8A8_UNORM for vertex colors
#1690
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Rather than using `VK_FORMAT_R8G8B8A8_UINT` for these vertex attributes and then dividing by `255.0` in each of the shaders, the `VK_FORMAT_R8G8B8A8_UNORM` format will automatically remap byte components into the `0.0-1.0` range and removes the need to do the extra divisions or castings within the shader.
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Rather than using
VK_FORMAT_R8G8B8A8_UINTfor these vertex attributes and then dividing by255.0in each of the shaders, theVK_FORMAT_R8G8B8A8_UNORMformat will automatically remap byte components into the0.0-1.0range and removes the need to do the extra divisions or castings within the shader.