header: Update to 1.0.48 Vulkan version

- updated include/vulkan/vulkan.h
- updated scripts/vk.xml
- updated layers json files
- updated tests json files
- updated vulkan.hpp

Change-Id: I90407d181ad6a4652e1d1f210ee9b9d21c7857b0
diff --git a/include/vulkan/vulkan.hpp b/include/vulkan/vulkan.hpp
index b5fb19d..ebb3ffe 100644
--- a/include/vulkan/vulkan.hpp
+++ b/include/vulkan/vulkan.hpp
@@ -42,7 +42,7 @@
 # include <vector>
 #endif /*VULKAN_HPP_DISABLE_ENHANCED_MODE*/
 
-static_assert( VK_HEADER_VERSION ==  47 , "Wrong VK_HEADER_VERSION!" );
+static_assert( VK_HEADER_VERSION ==  48 , "Wrong VK_HEADER_VERSION!" );
 
 // 32-bit vulkan is not typesafe for handles, so don't allow copy constructors on this platform by default.
 // To enable this feature on 32-bit platforms please define VULKAN_HPP_TYPESAFE_CONVERSION