Define expected behavior for a well-behaved loader, layers, and drivers.
This has been reviewed with other companies so that when issues arise,
it is easy to clearly communicate where one of the components has failed
to properly behave.
Add warnings/errors in the loader output when cases of policy that can
be detected are noticed.
Feedback from Khronos was that "Implementation" was for the entire
set of Vulkan components underlying the application (including the
loader, layers, and drivers). Instead, what I had been calling
implementation should be called "Driver" including software
implementations of Vulkan at that level.
Also update the LOADER_DEBUG option "implem" to take "driver" as well.
All images also updated.
Charles Giessen