refactor layout.h into single file per Node* classes

engine/node_border.h

@@ -0,0 +1,18 @@
+#pragma once
+#include "node.h"
+#include "shape.h"
+
+class NodeBorder : public Node
+{
+public:
+    static ui::Plane m_plane;
+    glm::vec4 m_color{ 0, 0, 0, 1 };
+    glm::vec4 m_border_color{ 1, 1, 1, 1 };
+    float m_thinkness{ 0 };
+    NodeBorder();
+    static void static_init();
+    virtual Node* clone_instantiate() const override;
+    virtual void clone_copy(Node* dest) const override;
+    virtual void parse_attributes(kAttribute ka, const tinyxml2::XMLAttribute* attr) override;
+    virtual void draw() override;
+};