header: Update to 1.0.45 Vulkan version

- updated include/vulkan/vulkan.h
- updated scripts/vk.xml
- updated layers json files
- updated tests json files
- updated include/vulkan/vulkan.hpp
- FIXED scripts/vk.xml (see note)

NOTE:
This commit also includes an unofficial change to vk.xml.  The 1.0.45
header update broke the structure definition for device_features2. The
mangled line has been replaced in this update.

Change-Id: If646355a5b211ca90484d449a1c55412decc3de6