message: Add const iterators to Array class
diff: @@ -254,6 +254,8 @@ public:
  // STL-like begin/end
  inline T* begin() { return data; }
  inline T* end() { return data + size; }
  + inline const T* begin() const { return data; }
  + inline const T* end() const { return data + size; }
  long MemoryUsage() const { return Capacity() * sizeof(T); }
  