v1.9.8

• Fix a few Fence-related bugs
• gltfio: add createInstance() to AssetLoader.
• gltfio: fix ASAN issue when consuming invalid animation.
• gltfio: do not segfault on invalid primitives.
• gltfio: add safety checks to getAnimator.
• gltfio: fix segfault when consuming invalid file.
• Vulkan: various internal refactoring and improvements
• mathio: add ostream operator for quaternions.
• Fix color grading not applied when dithering is off.