Small error in how mouse events are processed. I need to do them _outside_ of the guecs::UI so that the event is checked once and then confirmed in all grids. Then created a tombstone device to be used as a dead enemy marker that will later allow looting.

systems.cpp

@@ -125,6 +125,10 @@ void System::death(GameLevel &level) {
         world.send<Events::GUI>(Events::GUI::DEATH, ent, {});
       } else {
         // remove their motion so they're dead
+        // CHANGE: this needs to remove the enemies that are
+        // dead and then replace them at that position with
+        // a gave_stone device. And then that makes it so you
+        // can loot their dead bodies.
         world.remove<Motion>(ent);
       }
     }