New feature for SDK: AbstractControl + Button

I opened this Issue to keep track of forum discussions to add the ability to create in custom AbstractControls, functions that can be executed by button clicks.

https://hub.jmonkeyengine.org/t/new-feature-for-sdk-abstractcontrol-buttonproperty/46927

It requires the creation of a dedicated library, for example jme-sdk-devtools, to be published on the MAVEN repository. In this way, the library can be used by users in their Maven or Gradle projects to add graphical functions to AbstractControls and write their own editors with the SDK.

Here is an example:

1. ButtonProperty

import java.lang.annotation.*;

@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.METHOD)
public @interface ButtonProperty {

    String name() default "";
    
    String tooltip() default "";
}

2. MyControl

public class MyControl extends AbstractControl {

    @Override
    protected void controlUpdate(float tpf) {
    }

    @Override
    protected void controlRender(RenderManager rm, ViewPort vp) {
    }
    
    @ButtonProperty(name="Click Me", tooltip="sayHello")
    public void sayHello() {
        System.out.println("Hello: " + MyControl.class.getSimpleName());
    }

}

3. UIBuilder

import java.lang.reflect.Method;
import org.apache.commons.lang3.reflect.MethodUtils;
import com.jme3.scene.control.Control;

import javax.swing.*;

...

    public static JPanel buildPanel(Control control) {

        JPanel container = new JPanel(false);
        container.setLayout(new MigLayout("fillx"));

        ...
        
        List<Method> methods = MethodUtils.getMethodsListWithAnnotation(control.getClass(), ButtonProperty.class);
        for (Method method : methods) {
            ButtonProperty bp = method.getAnnotation(ButtonProperty.class);
            JButton button = new JButton(bp.name());
            button.setToolTipText(bp.tooltip());
            button.addActionListener(e ->  {
                try {
                    method.invoke(control);
                } catch (ReflectiveOperationException ex) {
                    ex.printStackTrace();
                }
            }));
            
            container.add(new JLabel(""), "align righ");
            container.add(button, "wrap, pushx, growx");
        }

        return container;
    }

Start with the linked forum discussion and the proposed AbstractControl, ButtonProperty, and UIBuilder examples. Define the scope of the dedicated jme-sdk-devtools library, including its Maven publication and how annotated control methods become buttons in SDK editors. Done means the library and integration behavior are specified well enough to implement and consume from Maven or Gradle projects.