Cleanup readme

Add C++17 std::string_view support (#287)

* Add C++17 std::string_view support (LUABRIDGE_CXX17 macro).
* Fix __stdcall support (MSVS 2022).
* Use multi-process compilation for MSVS.
* Update cmake files formatting.

Update documentation (#233)

* Update Doxygen documentation.
* Add brief API reference to the manual.
* Update CHANGES.md for 2.6.

Introduce isInstance type checking function (#218)

* Introduce Stack<T>::isInstance() function
* Fix build error

Do not call the object destructor then its constructor throws (#114)

Fix table traversal (#199) and other changes (#208)

* Introduce enableExceptions function.
* Fix table traversal (#207).
* Add enumeration stack specialization example (#127).

Fix registration continuation for already registered class (#198)

Fix registration continuation issues (#196)

Update documentation for version 2.3 (#195)

Performance optimization (#192)

* Replace all internally used string keys with lightuserdata keys
* Up to 10% speed up