Fix for #64 - added fallback for VS22 17.11+ in GetPointer

[vojtechmusilek]

Added fallback to non generic pointer which seems to work after the changes in 17.11+.
This fixes issue #64 .

Tested on:

• VS22 - 17.10 (17.10.5)
• VS22 - 17.13 (17.13.0)

Tested with:

• C#
  • var genericList = new List()
  • var points = new List<System.Drawing.PointF>()
  • var array = new double[100]
  • var linkedList = new LinkedList()
  • IList
  • ICollection
  • IEnumerable
• C++
  • int c_array[100]
  • std::vector stl_vector(100)
  • std::array<int, 100>
  • std::deque stl_deque
  • std::list stl_list
  • std::set stl_set
  • boost::array<int, 100> boost_array
  • boost::circular_buffer boost_circular_buffer(100)
  • boost::container::vector boost_vector(100)
  • boost::container::static_vector<int, 100> boost_static_vector

[vojtechmusilek]

After further investigation, it seems like when I remove the 'genericPtrExpr' and keep only the fallback code, everything still works. But I'm not sure if that wouldn't break something else.

[awulkiew]

Thanks for the PR. I haven't looked into this issue yet due to the lack of free time. It seems to be wierd that C# is affected by pointers but maybe I'm missing something.