VisualBuilder: Start working on an interface builder application.

It's tedious making interfaces programmatically. Let's make a program to
help us with this. :^)

Applications/VisualBuilder/VBForm.h

@@ -0,0 +1,20 @@
+#pragma once
+
+#include <LibGUI/GWidget.h>
+#include <AK/Vector.h>
+#include "VBWidget.h"
+
+class VBForm : public GWidget {
+public:
+    explicit VBForm(const String& name, GWidget* parent = nullptr);
+    virtual ~VBForm() override;
+
+protected:
+    virtual void paint_event(GPaintEvent&) override;
+
+private:
+    String m_name;
+    int m_grid_size { 5 };
+
+    Vector<VBWidget*> m_widgets;
+};