Added the basics for a scene explorer in ImGui

SandboxApplication/GUI.cpp

@@ -1,5 +1,32 @@
 #include "GUI.h"
 
+void SceneExplorer(Scene& scene, std::string PanelName) {
+    ImGui::Begin(PanelName.c_str());
+
+    ImGui::ListBoxHeader("##ObjectList");
+
+    Node& current = scene.GetRoot();
+
+    Node* next = &current;
+
+    // Show first node
+    ImGui::Selectable(next->name.c_str(), true);
+
+    ImGui::Indent();
+
+    if (next->children.size() != 0) {
+        for (auto child : next->children) 
+        {
+            std::string& name = child->name;
+            ImGui::Selectable(name.c_str(), false);
+        }
+    }
+
+    ImGui::ListBoxFooter();
+
+    ImGui::End();
+}
+
 void CameraTool(Camera* cam) {
 
     ImGui::Begin("Camera");