* Make C++20 modules work with the defaultDispatchLoaderDynamic.
* Add vulkan_hpp_macros.hpp to list of installed files.
* Adjust the text on module in the readme.
* Rename module from vulkan to vulkan_hpp
* Adjust some comments.
* Add a little disclaimer to vulkan.cppm.
* Bug fixes for C++20 module
- Removed nested `export` keyword for `vk::raii` namespace in C++ module file
- Fixed macro in `vulkan.cppm` for `vk::DynamicLoader`: changed from `VULKAN_HPP_DYNAMIC_LOADER_TOOL` to `VULKAN_HPP_ENABLE_DYNAMIC_LOADER_TOOL`
- Moved VulkanHppModule declaration before generator
- Fixed `CMakeLists.txt` for `Cpp20Modules` executable target
* Use `VULKAN_HPP_CONSTEXPR_INLINE` for constants in `vulkan.hpp`
- Added VULKAN_HPP_CONSTEXPR_INLINE macro definition
- Allow external linkage for these constants in C++17 and later
