Mise à jour => Vulkan v1.2.140
Changes: - Updated `known_good.json` - Propagated `loader_genvk.py` changes - Generated new source files - Modified `.gitattributes` to ensure generated source files should always have LF line endings because that is how it will be generated on all platforms going forward. Upstream change in Vulkan-Docs explicitly generates code with LF line endings. - Removed automatic CRLF to LF conversion git setting in `.appveyor.yml`