Release 4.0.6

Merge pull request nemtrif#120 from ufleisch/arch-independent

Use ARCH_INDEPENDENT with write_basic_package_version_file

Release 4.0.4

Release 4.0.3

Merge pull request nemtrif#113 from ufleisch/fix-cmake

Fix CMake build system to use existing include directory (nemtrif#112)

Version 4.0.1

Merge V4 branch into main (nemtrif#110)

* Redefined and renamed types for code units.

* Remove -Wsign-conversion from test builds.

* find_invalid and is_valid that work with C-style strings.

* Lifted the C++11 requirement for some functions
 that take std::string as an argument.

* Support for C++20 u8string

Issue nemtrif#89

* Update test docker image to 4.0.0

* Update Dockerfile to run tests with a recent gcc compiler.

* Make some internal helper functions non-template

* Add append16 function

Support for appending codepoints to existing utf16 encoded strings.

See nemtrif#91

* next16

* Tests and documentation for next16

* Rewrite CMakeLists

Drop the existing CMake structure and write the new one from scratch. The root CMakeLists.txt is used for installing the package without building and running tests. Testing is done via a separate CMakeLists.txt in the tests directory.

* Remove "samples" directory.

The content of that file is already in the documentation.

* Update README.md

Restructure the reference, add installation instructions, toc, other minor changes

Version 3.2.5

Version 3.2.4

Remove -Wsign-conversion from test builds.