headers: Update to Vulkan header version 1.1.97

Updated:
- `include/vulkan/vulkan.h`
- `include/vulkan/vulkan.hpp`
- `include/vulkan/vulkan_android.h`
- `include/vulkan/vulkan_core.h`
- `include/vulkan/vulkan_fuchsia.h`
- `include/vulkan/vulkan_ios.h`
- `include/vulkan/vulkan_macos.h`
- `include/vulkan/vulkan_vi.h`
- `include/vulkan/vulkan_wayland.h`
- `include/vulkan/vulkan_win32.h`
- `include/vulkan/vulkan_xcb.h`
- `include/vulkan/vulkan_xlib.h`
- `include/vulkan/vulkan_xlib_xrandr.h`
- `registry/cgenerator.py`
- `registry/generator.py`
- `registry/genvk.py`
- `registry/reg.py`
- `registry/validusage.json`
- `registry/vk.xml`

include/vulkan/vulkan_ios.h

@@ -6,7 +6,7 @@ extern "C" {
 #endif
 
 /*
-** Copyright (c) 2015-2018 The Khronos Group Inc.
+** Copyright (c) 2015-2019 The Khronos Group Inc.
 **
 ** Licensed under the Apache License, Version 2.0 (the "License");
 ** you may not use this file except in compliance with the License.