Excel Range should not act as an Array

[gdementen]

It makes things ambiguous, and it cuts users from using some of xlwings features cleanly (e.g. Range.insert). There is also more opportunities to break user code relying on xlwings methods and we add a method with the same name in Array (in addition to the same problem when we add methods to Range, which should be much rarer).

i.e.

        def __getattr__(self, key):
            if hasattr(Array, key):
                return getattr(self.__larray__(), key)
            else:
                return getattr(self.xw_range, key)

should be changed to:

        def __getattr__(self, key):
            return getattr(self.xw_range, key)