Minor changes to math module

-Fixed missing Set method: "X::Set(const X&)"
-Removed operator String


Former-commit-id: 690f161704ed85fc57a62b812af7933e390572b5

include/Nazara/Math/Vector3.hpp

@@ -53,6 +53,7 @@ template<typename T> class NzVector3
 		NzVector3& Set(T scale);
 		NzVector3& Set(const T vec[3]);
 		NzVector3& Set(const NzVector2<T>& vec, T Z = 0.0);
+		NzVector3& Set(const NzVector3<T>& vec);
 		template<typename U> NzVector3& Set(const NzVector3<U>& vec);
 
 		T SquaredDistance(const NzVector3& vec) const;
@@ -60,8 +61,6 @@ template<typename T> class NzVector3
 
 		NzString ToString() const;
 
-		operator NzString() const;
-
 		operator T*();
 		operator const T*() const;