Xcode: Add schemes: GPU Validation & default build configuration
requested to merge PatriceJiang/cmake:xcode-add-gpu-validation-and-default-configuration into master
Add Xcode Scheme properties:
XCODE_SCHEME_ENABLE_GPU_API_VALIDATIONXCODE_SCHEME_ENABLE_GPU_SHADER_VALIDATIONXCODE_SCHEME_LAUNCH_CONFIGURATION
Edited by Brad King