Moved physics and application outside of core

Nuake/src/Application/LayerStack.cpp

@@ -0,0 +1,40 @@
+#include "LayerStack.h"
+#include "Layer.h"
+
+namespace Nuake {
+
+	LayerStack::LayerStack()
+	{
+		m_LayerInsert = m_Layers.begin();
+	}
+
+	void LayerStack::PushLayer(Ref<Layer> layer)
+	{
+		m_LayerInsert = m_Layers.emplace(m_LayerInsert, std::move(layer));
+	}
+
+	void LayerStack::PushOverlayLayer(Ref<Layer> layer)
+	{
+		m_Layers.emplace_back(std::move(layer));
+	}
+
+	void LayerStack::PopLayer(Ref<Layer> layer)
+	{
+		auto it = std::find(m_Layers.begin(), m_Layers.end(), layer);
+		if (it != m_Layers.end())
+		{
+			m_Layers.erase(it);
+			m_LayerInsert--;
+		}
+	}
+
+	void LayerStack::PopOverlayLayer(Ref<Layer> layer)
+	{
+		auto it = std::find(m_Layers.begin(), m_Layers.end(), layer);
+		if (it != m_Layers.end())
+		{
+			m_Layers.erase(it);
+		}
+	}
+
+}