Introduce implicit cast operators for vk::UniqueHandles, vk::SharedHandles and vk::raii::Handles #1771
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Add an implicit cast for the vk::UniqueHandles and the vk::SharedHandles, "hidden" by the define
VULKAN_HPP_SMART_HANDLE_IMPLICIT_CAST
. Those two handle wrapper are semantically very close to the corresponding pointer types and thus the implicit cast is not a perfect fit. Making it available by an opt-in seems to be reasonable.The vk::raii::Handles, on the other hand, are more a non-pointer wrapper, and thus get the implicit-cast unconditionally.
Resolves #1731.