feat: Added layout manager to save and restore custom layouts

lib/libimhex/include/hex/api/layout_manager.hpp

@@ -0,0 +1,38 @@
+#pragma once
+
+#include <hex.hpp>
+#include <hex/helpers/fs.hpp>
+
+#include <string>
+#include <variant>
+
+#include <nlohmann/json_fwd.hpp>
+#include <imgui.h>
+
+namespace hex {
+
+    class LayoutManager {
+    public:
+        struct Layout {
+            std::string name;
+            std::fs::path path;
+        };
+
+        static void save(const std::string &name);
+        static void load(const std::fs::path &path);
+        static void loadString(const std::string &content);
+
+        static std::vector<Layout> getLayouts();
+
+        static void process();
+        static void reload();
+
+    private:
+        LayoutManager() = default;
+
+        static std::optional<std::fs::path> s_layoutPathToLoad;
+        static std::optional<std::string> s_layoutStringToLoad;
+        static std::vector<Layout> s_layouts;
+    };
+
+}

lib/libimhex/include/hex/helpers/fs.hpp

@@ -40,6 +40,7 @@ namespace hex::fs {
         Themes,
         Libraries,
         Nodes,
+        Layouts,
 
         END
     };