Minor changes to math module

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


Former-commit-id: 690f161704ed85fc57a62b812af7933e390572b5

include/Nazara/Math/Rect.hpp

@@ -41,13 +41,12 @@ class NzRect
 
 		NzRect& Set(T X, T Y, T Width, T Height);
 		NzRect& Set(const T rect[4]);
+		NzRect& Set(const NzRect<T>& rect);
 		NzRect& Set(const NzVector2<T>& vec1, const NzVector2<T>& vec2);
 		template<typename U> NzRect& Set(const NzRect<U>& rect);
 
 		NzString ToString() const;
 
-		operator NzString() const;
-
 		T& operator[](unsigned int i);
 		T operator[](unsigned int i) const;