(Matrix4) Renamed Destroy to Undefine, fixed bug

Fixed Transpose() not checking COW ownership


Former-commit-id: de2c64b9aef5abf2f73ce6cff2fe8442c1c382c5

include/Nazara/Math/Matrix4.hpp

@@ -43,8 +43,6 @@ class NzMatrix4
 		NzMatrix4 Concatenate(const NzMatrix4& matrix) const;
 		NzMatrix4 ConcatenateAffine(const NzMatrix4& matrix) const;
 
-		void Destroy();
-
 		T GetDeterminant() const;
 		NzMatrix4 GetInverse(bool* succeeded = nullptr) const;
 		NzMatrix4 GetInverseAffine(bool* succeeded = nullptr) const;
@@ -94,6 +92,8 @@ class NzMatrix4
 
 		NzMatrix4& Transpose();
 
+		NzMatrix4& Undefine();
+
 		operator NzString() const;
 
 		operator T*();