replace combined stateUpdated signal with individual events

src/lib/eventsystem/event/BuildingBlocksChangedEvent.h

@@ -0,0 +1,14 @@
+#ifndef BUILDING_BLOCKS_CHANGED_EVENT_H
+#define BUILDING_BLOCKS_CHANGED_EVENT_H
+
+#include "Event.h"
+
+class BuildingBlocksChangedEvent : public Event
+{
+public:
+	explicit BuildingBlocksChangedEvent(int blocks) : blocks(blocks) {}
+	const int blocks;
+};
+
+#endif   // BUILDING_BLOCKS_CHANGED_EVENT_H
+