refactor Quaternion class (#20031)

* remove redundant copy constructor and destructor

Author: JohnCoconut

cocos/math/Quaternion.cpp

@@ -53,15 +53,6 @@ Quaternion::Quaternion(const Vec3& axis, float angle)
     set(axis, angle);
 }
 
-Quaternion::Quaternion(const Quaternion& copy)
-{
-    set(copy);
-}
-
-Quaternion::~Quaternion()
-{
-}
-
 const Quaternion& Quaternion::identity()
 {
     static Quaternion value(0.0f, 0.0f, 0.0f, 1.0f);

cocos/math/Quaternion.h

@@ -125,18 +125,6 @@ class CC_DLL Quaternion
      */
     Quaternion(const Vec3& axis, float angle);
 
-    /**
-     * Constructs a new quaternion that is a copy of the specified one.
-     *
-     * @param copy The quaternion to copy.
-     */
-    Quaternion(const Quaternion& copy);
-
-    /**
-     * Destructor.
-     */
-    ~Quaternion();
-
     /**
      * Returns the identity quaternion.
      *