Marking some extensions as "not expected to be supported by driver"

[spencer-lunarg]

There are some extension VK_EXT_validation_features, VK_EXT_debug_utils, VK_EXT_layer_settings that are not suppose to be implemented by the driver, but instead the loader/layers

This becomes an issue for people newer to Vulkan and mix the fact "gpuinfo says no one supports VK_EXT_debug_utils so I can't use it" vs "the driver itself doesn't do the work"

One idea was maybe having some asterisk or some UI marker to help mark these (or maybe remove from the display at all)

If you want to go ahead with this, I can gather all the "drivers aren't expected to implement it" extensions for you as well