v0.9.1

• The Demand Geometry Viewer sample was updated with one-shot resolution of proxy geometries and materials. The Demand Material library is now used by the sample.
• The stb library details were moved to the FetchStb CMake module and vcpkg support was added.
• Added vcpkg support for obtaining the imgui, glfw and glad dependencies.
• The Demand Texture Viewer sample updated to load any image source and not just EXR files. Command-line options added to apply mipmap and tile adapters to the loaded image source.
• The ImageSource CMake module was updated to create a 'resource' target associated with the target for which image tests are being run. This keeps gold images and resource files in the binary directory up to date if they change in the source directory. A FOLDER parameter was added to specify the FOLDER property for the resource target. A RESOURCES parameter was added to specify additional resource files, besides the implied gold image for the test, to be copied to the binary directory. This is usually used to copy additional program inputs such as scene files. Failure output was improved for readability.