Adapt for web, make CharacterState class

src/Location.h

@@ -85,7 +85,6 @@ namespace ZL
 		// "Walk to NPC, then fire on_npc_interact" — mirrors targetInteractiveObject
 		// so a click from outside interactionRadius still leads to a Lua callback
 		// once the player gets close enough.
-		Character* targetInteractNpc = nullptr;
 		int targetInteractNpcIndex = -1;
 
 		std::unique_ptr<TextRenderer> npcNameText;