Implemented entity.GetType() in lua

This will only work for userdata decented from the Entity base class.
Using something else results in undefined behavior.

server/entities/entity.hpp

@@ -25,6 +25,8 @@
 #include "bounding_box.hpp"
 #include "vector2.hpp"
 
+#include <string>
+
 //The base class for all objects in the world
 class Entity {
 public:
@@ -41,14 +43,17 @@ public:
 	Vector2 GetMotion() const;
 	BoundingBox GetBounds() const;
 
+	const char* GetType() const;
+
 protected:
-	Entity() = default;
+	Entity(const char*);
 	virtual ~Entity() = default;
 
 	int roomIndex = -1;
-	Vector2 origin;
-	Vector2 motion;
-	BoundingBox bounds;
+	Vector2 origin = {0, 0};
+	Vector2 motion = {0, 0};
+	BoundingBox bounds = {0, 0, 0, 0};
+	const char* type;
 };
 
 #endif