* Bump API patch number and header version number to 30 for this update.
Github Issues:
* Document missing pname:sType and pname:pNext parameters for
slink:VkCommandBufferInheritanceInfo (public issue 224).
* As promised, we are removing the example code, from the appendix, for
the VK_KHR_surface and VK_KHR_swapchain extensions. The cube demo
(shipped in the official Khronos SDK) has been updated, and is the
example code that we want people to look at for how to use these two
extensions (public issues 279, 308, and 311).
* Clarify the formats for which the slink:VkClearColorValue pname:float32
member is used. Also clean up related language for flink:vkCmdBlitImage
(public issue 369).
* Reword the <<invariance, Invariance>> appendix chapter to better match
Vulkan terminology (public issue 372).
Internal Issues:
* Update slink:VkMemoryRequirements to not require a host_visible memory
type exists that can be bound to sparse buffers (internal issue 494).
* Modify the <<features-supported-sample-counts,Supported Sample Counts>>
language to allow multisampled depth-stencil images (internal issue
521).
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