Moved menu code into GUI

Button events are now sent when you click.

src/Engine/GUI/ButtonSystem.cpp

@@ -0,0 +1,78 @@
+#include "GUI/ButtonSystem.h"
+
+ButtonSystem::ButtonSystem(SystemParams params, IRenderer* renderer)
+    : System(params)
+    , PureSystem("Button")
+    , m_Renderer(renderer)
+{
+    EVENT_SUBSCRIBE_MEMBER(m_EMousePress, &ButtonSystem::OnMousePress);
+    EVENT_SUBSCRIBE_MEMBER(m_EMouseRelease, &ButtonSystem::OnMouseRelease);
+    EVENT_SUBSCRIBE_MEMBER(m_EMouseLock, &ButtonSystem::OnMouseLock);
+    EVENT_SUBSCRIBE_MEMBER(m_EMouseUnlock, &ButtonSystem::OnMouseUnlock);
+}
+
+
+bool ButtonSystem::OnMouseLock(const Events::LockMouse& e)
+{
+    m_MouseIsLocked = true;
+    return true;
+}
+
+
+bool ButtonSystem::OnMouseUnlock(const Events::UnlockMouse& e)
+{
+    m_MouseIsLocked = false;
+    return true;
+}
+
+
+bool ButtonSystem::OnMousePress(const Events::MousePress& e)
+{
+    if (e.Button == GLFW_MOUSE_BUTTON_1 && !m_MouseIsLocked) {
+        m_PickData = m_Renderer->Pick(glm::vec2(e.X, e.Y));
+        if (m_PickData.Entity != EntityID_Invalid && m_PickData.World == m_World) {
+            if(m_World->HasComponent(m_PickData.Entity, "Button")) {
+                //Entity is a button, save it and send pressed event.
+
+                m_PickEntity = EntityWrapper(m_World, m_PickData.Entity);
+
+                //You have clicked on a button entity, send pressed event.
+                Events::ButtonPressed ePressed;
+                ePressed.EntityName = m_PickEntity.Name();
+                m_EventBroker->Publish(ePressed);
+            }
+        }
+    }
+    return true;
+}
+
+bool ButtonSystem::OnMouseRelease(const Events::MouseRelease& e)
+{
+    if(!m_MouseIsLocked) {
+        //Mouse is not locked, send release event.
+        Events::ButtonReleased eReleased;
+        m_EventBroker->Publish(eReleased);
+        m_PickData = m_Renderer->Pick(glm::vec2(e.X, e.Y));
+        if(m_PickData.Entity != EntityID_Invalid && m_PickData.World == m_World) {
+            if(m_World->HasComponent(m_PickData.Entity, "Button")) {
+                EntityWrapper ent = EntityWrapper(m_World, m_PickData.Entity);
+                if (ent == m_PickEntity) {
+                    //The entity you released the mouse button on is the same as you pressed it on. "Clicked"
+                    Events::ButtonClicked eClicked;
+                    eClicked.EntityName = m_PickEntity.Name();
+                    m_EventBroker->Publish(eClicked);
+                }
+            }
+        }
+    }
+    return true;
+}
+
+void ButtonSystem::UpdateComponent(EntityWrapper& entity, ComponentWrapper& cHealth, double dt)
+{
+
+}
+
+
+
+