add layout designer

src/layout.h

@@ -13,10 +13,10 @@
 
 class LayoutManager
 {
-    std::map<uint16_t, std::shared_ptr<class Node>> m_layouts;
     std::string m_path;
     struct stat m_file_info { 0 };
 public:
+    std::map<uint16_t, std::shared_ptr<class Node>> m_layouts;
     bool m_loaded = false;
     std::function<void(bool reloaded)> on_loaded;
     std::function<void()> on_reloading;