Move windows to uptr. Add simple text editing.

src/windows/managers/EventManager.cpp

@@ -0,0 +1,24 @@
+#include "EventManager.h"
+
+
+EventManager::EventManager()
+    : mEvents()
+{
+
+}
+
+std::unique_ptr<EventManager> EventManager::Create()
+{
+    return std::make_unique<EventManager>();
+}
+
+UiEvent* EventManager::AddEvent(UiEventUPtr event)
+{
+    mEvents.push_back(std::move(event));
+    return mEvents[mEvents.size()-1].get();
+}
+
+void EventManager::ClearEvents()
+{
+    mEvents.clear();
+}