nui_error_utils library

1. nui_error_handler package
2. documentation
3. nui_error_utils.dart

nui_error_handler package

1. Libraries
2. nui_error_database
3. nui_error_handler
4. nui_error_handler_action
5. nui_error_models
6. nui_error_ui_components
7. nui_error_utils