KlemmUI 3

A C++20 UI library (maybe even a framework?) for creating lightweight cross platform GUI apps.

Major changes from KlemmUI 2:

• SDL removed as a dependency, all windowing code is rewritten.
• CMake now is the only build system.
• Added resource generator.
• More options for styling backgrounds.
• Better support for translation.
• Added UIBlurBackground and UISpinner elements.
• Improved how the UITextField element works.
• Changed the way the resource generator and UI language are used in CMake to better work with the Ninja generator.

Library features

• Support for creating GUI apps on Windows and Linux.
• A language for describing UI layouts that is compiled to C++ headers that can be included into regular code.
• A resource generator that can translate files into C code that can be used to embed files into applications.