Some improvements to some things.

src/client/creature.h

@@ -116,6 +116,7 @@ public:
     bool isWalking() { return m_walking; }
     bool isRemoved() { return m_removed; }
     bool isInvisible() { return m_outfit.getCategory() == ThingCategoryEffect && m_outfit.getAuxId() == 13; }
+    bool isDead() { return m_healthPercent <= 0; }
     bool canBeSeen() { return !isInvisible() || isPlayer(); }
 
     bool isCreature() { return true; }