* Update release number to 124.
Github Issues:
* Fix Makefile SPECREMARK macro to work when not building in a git tree
(public issue 992).
* Ignore pname:aspectMask for unused attachments in
slink:VkSubpassDescription2KHR valid usage statements (public pull
request 1028).
* Minor markup / spelling fixes (public pull requests 1035, 1045).
Internal Issues:
* Fix markup in Valid Usage statement for slink:VkCreateFramebuffer
(internal issue 1823).
* Add a new <<synchronization-signal-operation-order, _signal operation
order_>> section to the synchronization chapter which describes in
detail the ordering guarantees provided by the API between fence and
semaphore signal operations (internal merge request 3368).
* Move generated `appendix/meta/` files into the Makefile GENERATED
directory (internal merge request 3381).
New Extensions
* `<<VK_KHR_shader_clock>>`
* `<<VK_KHR_timeline_semaphore>>`
* Update release number to 99.
Public Issues:
* Add missing pname:pMemoryHostPointerProperties description to
flink:vkGetMemoryHostPointerPropertiesEXT.txt (public pull request 896).
* Minor markup fixes (public pull request 900).
* Minor update to `khronos.css` and markup fixes (originally proposed in
public pull request 901, but done via an internal MR).
Internal Issues:
* Document restrictions on image queries for Y'CbCr formats in the
<<features-formats-requiring-sampler-ycbcr-conversion>> table as well as
for slink:sname:VkImageFormatProperties and slink:VkImageCreateInfo
(internal issue 1361).
* Correct type of the code:FragSizeEXT built-in in the
<<interfaces-builtin-variables, Built-In Variables>> section (internal
issue 1526).
* Clean up math in the <<textures, Image Operations>> chapter by
refactoring, using better naming conventions, updating diagrams to use
the correct orientation, etc. (internal merge request 2968).
* Fix minor typos for slink:VkImageCreateInfo and
slink:VkImageStencilUsageCreateInfoEXT.
* Add missing documentation for tlink:VkResolveModeFlagsKHR.
* Fix extension dependency of pname:scalarBlockLayout in the
<<features-features-requirements, Feature Requirements>> section.
* Fix indexing math for shader binding table calculations in the
<<shader-binding-table-indexing-rules, Indexing Rules>> section, and use
spelling "`any-hit`" consistently.
* Reconcile valid usage statement and text for sampled image layouts in
slink:VkWriteDescriptorSet
(https://github.com/KhronosGroup/Vulkan-ValidationLayers/issues/551).
* Make SPIR-V code:OpConvertUToPtr and code:OpConvertPtrToU operations
require a 64-bit integer for physical storage buffer pointers in the
<<spirvenv-module-validation, Validation Rules within a Module>>
section.
* Update to KaTeX 10.0.
New Extensions:
* `VK_EXT_filter_cubic`
* `VK_NV_dedicated_allocation_image_aliasing`
