The library originates from Vulkan-ValidationLayers, but is being moved
into this repo to make it easier for others to use it.
The library has also been modified to be header only and C compatible,
which allows more developers to be able to use it. This does require some
changes, but only affects the vkuFormatElementSize and vkuFormatTexelSize
functions which used default parameters. Two new functions,
vkuFormatElementSizeWithAspect and vkuFormatTexelSizeWithAspect have been
added to handle the non-default image aspect case (the default was COLOR_BIT).
Renaming was done using the following convention:
* public header files begin with `vk_`
* enums begin with VKU_FORMAT_
* functions begin with vku
