restructure project for dynamic linking

modules/gui/layers/layerstack.h

@@ -0,0 +1,32 @@
+#pragma once
+
+#include "engine.h"
+
+#include "layer.h"
+
+
+class LayerStack {
+
+    public:
+        LayerStack();
+        ~LayerStack();
+
+        void pushLayer(Layer*);
+        void pushOverlay(Layer*);
+        void popLayer(Layer*);
+        void popOverlay(Layer*);
+
+        void propagateEvent(const Event*);
+        void updateLayers();
+        void shutdown();
+
+        inline Layer* getLayer(unsigned long i) { return layers.at(i); }
+
+        std::vector<Layer*>::iterator begin() {return layers.begin();}
+        std::vector<Layer*>::iterator end() {return layers.end();}
+
+    private:
+        std::vector<Layer*> layers;
+        std::vector<Layer*>::iterator insert;
+        bool eventHandled;
+};