switch to using own event system

src/lib/eventsystem/event/BlueprintPlacementRequestedEvent.h

@@ -0,0 +1,12 @@
+#pragma once
+
+#include "Blueprint.h"
+#include "Event.h"
+
+class BlueprintPlacementRequestedEvent : public Event
+{
+public:
+    explicit BlueprintPlacementRequestedEvent(Blueprint blueprint)
+        : blueprint(std::move(blueprint)) {}
+    const Blueprint blueprint;
+};