Overview of Changes in 4.15.4, 30-07-2024
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* GtkPopover:
 - Fix size allocation with wrapping labels

* GtkColumnView:
 - Check column visibility when measuring

* CSS:
 - Fix fallout from recent changes
 - Make implementation of currentcolor inheritance match browsers

* Gdk:
 - Introduce GdkColorState for encoding color space information
   Currently, we support srgb, srgb-linear, rec2100-pq and rec2100-linear
 - Add color states to GdkTexture, as well as to the texture builder
   and downloader objects, and convert as necessary
 - Add GdkMemoryTextureBuilder
 - Attach color states when loading or saving textures
 - Add GdkCicpParams to create color state objects for cicp tuples
 - Drop GDK_DEBUG=vulkan-validate
   Use VK_INSTEANCE_LAYERS=VK_LAYER_KHRONOS_validation instead

* Gsk:
 - Improve caching of glyphs and textures
 - Remove the uber shader
 - Numerous bug fixes
 - Fix corner cases in offload handling
 - Implement occlusion culling for opaque content
 - Allow offloading (some) transformed textures
 - Take colorstate into account when compositing
 - Add GDK_DEBUG=linear to opt into linear compositing
 - Implement tiling for large textures
 - Stop using descriptors and go back to simpler texture
   management that should work better with older GL
 - Use correct shader clip mode for glyphs
 - Improve shadow rendering

* Media:
 - Attach color states to textures obtained from gstreamer

* Wayland:
 - Allow offloading GL textures via dmabuf export
 - Suppot the xx-color-management-v4 protocol

* Deprecations:
 - GskGLShader and the render node

* Tools:
 - Improve the rendernode tool extract command
 - Add an image tool that is about manipulating textures

* Build:
 - GTK now requires a C11 compiler

* Translation updates
 Georgian
 Hebrew
 Hindi
 Occitan
 Slovenian