changed default constructor and initialized vectors with size to avoid early copying

SakuraCore/src/LayerStack.cpp

@@ -4,6 +4,12 @@
 #include <vector>
 
 namespace SakuraVNE {
+
+LayerStack::LayerStack() {
+    m_LayerStack.reserve(3);
+    m_CommandQueue.reserve(10);
+}
+
 LayerStack::~LayerStack() {
     for (auto &layer : m_LayerStack) {
         layer->OnDetach();

SakuraCore/src/LayerStack.h

@@ -16,7 +16,7 @@ struct LayerCommand {
 
 class LayerStack {
 public:
-    LayerStack() = default;
+    LayerStack();
     ~LayerStack();
 
     void PushLayer(std::unique_ptr<Layer> layer);