Clean up of sandbox

* Added a statistics panel
* Added comments to `Sandbox.cpp`
* Moved utility functions and GUI code out of sandbox.cpp

SandboxApplication/GUI.cpp

@@ -0,0 +1,31 @@
+#include "GUI.h"
+
+void CameraTool(Camera* cam) {
+
+    ImGui::Begin("Camera");
+
+    ImGui::SliderFloat("Zoom:", &cam->Zoom, 10, 190);
+
+    ImGui::End();
+}
+
+void ScriptingTool(char* code) {
+    ImGui::Begin("Scripting");
+
+    ImGui::InputTextMultiline("Lua Script", code, 255);
+    bool runCode = ImGui::Button("Run");
+
+
+    ImGui::End();
+
+}
+
+
+void transformWindow(Transform& transform, std::string PanelName) {
+    ImGui::Begin(PanelName.c_str());
+    ImGui::InputFloat3("Position:", (float*)&transform.Position[0]);
+    ImGui::InputFloat3("Rotation:", (float*)&transform.Rotation[0]);
+    ImGui::InputFloat3("Scale:", (float*)&transform.Scale[0]);
+    ImGui::End();
+
+}