Change from ENEMY_SPAWN to ENTITY_SPAWN since that's what it does. Closes #31

events.hpp

@@ -5,7 +5,7 @@ namespace Events {
     START, COMBAT, DEATH, STAIRS_UP, STAIRS_DOWN, TRAP,
     COMBAT_START, NO_NEIGHBORS, HP_STATUS,
     ATTACK, NEW_RITUAL,
-    UPDATE_SPRITE, ENEMY_SPAWN, NOOP,
+    UPDATE_SPRITE, ENTITY_SPAWN, NOOP,
     LOOT_ITEM, LOOT_CONTAINER,
     LOOT_CLOSE, LOOT_SELECT, INV_SELECT, AIM_CLICK
   };