refactor layout.h into single file per Node* classes

engine/node_text.h

@@ -0,0 +1,21 @@
+#pragma once
+#include "node.h"
+#include "font.h"
+
+class NodeText : public Node
+{
+public:
+    TextMesh m_text_mesh;
+    std::string m_text;
+    std::string m_font;
+    glm::vec4 m_color{ 1, 1, 1, 1 };
+    int m_font_size;
+    kFont font_id;
+    virtual Node* clone_instantiate() const override;
+    virtual void clone_copy(Node* dest) const override;
+    virtual void create() override;
+    virtual void restore_context() override;
+    virtual void parse_attributes(kAttribute ka, const tinyxml2::XMLAttribute* attr) override;
+    void set_text(const char* s);
+    virtual void draw() override;
+};