InventoryView now uses items instead of blocks (part I)

src/definitions.cpp

@@ -2,6 +2,7 @@
 
 #include <glm/glm.hpp>
 
+#include "content/ItemDef.h"
 #include "content/Content.h"
 #include "window/Window.h"
 #include "window/Events.h"
@@ -21,6 +22,9 @@ void setup_definitions(ContentBuilder* builder) { // Strange function, need to R
 	block->selectable = false;
 	block->model = BlockModel::none;
 	builder->add(block);
+
+    ItemDef* item = builder->createItem("core:empty");
+    item->iconType = item_icon_type::none;
 }
 
 void setup_bindings() {