refactor to separated entities, init abstractions

src/Abstract/Entity/Button.php

@@ -0,0 +1,41 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Yggverse\Yoda\Abstract\Entity;
+
+abstract class Button
+{
+    public \GtkButton $gtk;
+
+    protected bool   $_sensitive = false;
+    protected string $_label = 'Button';
+
+    public function __construct()
+    {
+        $this->gtk = new \GtkButton;
+
+        $this->gtk->set_sensitive(
+            $this->_sensitive
+        );
+
+        $this->gtk->set_label(
+            $this->_label
+        );
+
+        $this->gtk->connect(
+            'clicked',
+            function(
+                \GtkButton $entity
+            ) {
+                $this->_onClick(
+                    $entity
+                );
+            }
+        );
+    }
+
+    abstract protected function _onClick(
+        \GtkButton $entity
+    ): void;
+}