The library is configured with a ini file (config.ini).

Performance: QSettings loads foreach items => Configuration class with static structures to optimize in the futur.
Zoom in/out with scroll mouse.
Add Input/Output for ItemNode.
Add Settings singleton to configure the objects.
Add examples to have library's examples and to test.
Fix the global static settings (namespace and methods with static local var).
Refactoring class with new settings.
Add new examples.