-> vk::raii::Context constructor now either gets
no argument as before, loading vkGetInstanceProcAddr via an internal DynamicLoader;
or a PFN_vkGetInstanceProcAddr, using that to fill the dispatcher
+ changed the sample RAII_Samples/RayTracing to work with VULKAN_HPP_ENABLE_DYNAMIC_LOADER_TOOL defined to be zero
+ fixed the missing destructor call in most of the move assignments of the vk::raii classes