wxArray<T> macros have been changed to fix runtime problems under 64 bit

wxArray<T> macros have been changed to fix runtime problems under 64 bit
architectures. The base class is now implemented once for each needed
primitive type in order to avoid invalid reference casts. Macros are
provided to implement new arrays using these primitive base arrays.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@14458 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775